Move test into test/std subdirectory.

llvm-svn: 224658

6 files changed, 8169 insertions, 0 deletions

diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
new file mode 100644
index 00000000000..dda7428992a
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
@@ -0,0 +1,77 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// int compare(const charT *s) const;
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+int sign(int x)
+{
+    if (x == 0)
+        return 0;
+    if (x < 0)
+        return -1;
+    return 1;
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, int x)
+{
+    assert(sign(s.compare(str)) == sign(x));
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    test(S(""), "", 0);
+    test(S(""), "abcde", -5);
+    test(S(""), "abcdefghij", -10);
+    test(S(""), "abcdefghijklmnopqrst", -20);
+    test(S("abcde"), "", 5);
+    test(S("abcde"), "abcde", 0);
+    test(S("abcde"), "abcdefghij", -5);
+    test(S("abcde"), "abcdefghijklmnopqrst", -15);
+    test(S("abcdefghij"), "", 10);
+    test(S("abcdefghij"), "abcde", 5);
+    test(S("abcdefghij"), "abcdefghij", 0);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", -10);
+    test(S("abcdefghijklmnopqrst"), "", 20);
+    test(S("abcdefghijklmnopqrst"), "abcde", 15);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", 0);
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test(S(""), "", 0);
+    test(S(""), "abcde", -5);
+    test(S(""), "abcdefghij", -10);
+    test(S(""), "abcdefghijklmnopqrst", -20);
+    test(S("abcde"), "", 5);
+    test(S("abcde"), "abcde", 0);
+    test(S("abcde"), "abcdefghij", -5);
+    test(S("abcde"), "abcdefghijklmnopqrst", -15);
+    test(S("abcdefghij"), "", 10);
+    test(S("abcdefghij"), "abcde", 5);
+    test(S("abcdefghij"), "abcdefghij", 0);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", -10);
+    test(S("abcdefghijklmnopqrst"), "", 20);
+    test(S("abcdefghijklmnopqrst"), "abcde", 15);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", 0);
+    }
+#endif
+}
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
new file mode 100644
index 00000000000..9ed58a3e9bb
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
@@ -0,0 +1,372 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// int compare(size_type pos, size_type n1, const charT *s) const;
+
+#include <string>
+#include <stdexcept>
+#include <cassert>
+
+#include "min_allocator.h"
+
+int sign(int x)
+{
+    if (x == 0)
+        return 0;
+    if (x < 0)
+        return -1;
+    return 1;
+}
+
+template <class S>
+void
+test(const S& s, typename S::size_type pos1, typename S::size_type n1,
+     const typename S::value_type* str, int x)
+{
+    try
+    {
+        assert(sign(s.compare(pos1, n1, str)) == sign(x));
+        assert(pos1 <= s.size());
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos1 > s.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), 0, 0, "", 0);
+    test(S(""), 0, 0, "abcde", -5);
+    test(S(""), 0, 0, "abcdefghij", -10);
+    test(S(""), 0, 0, "abcdefghijklmnopqrst", -20);
+    test(S(""), 0, 1, "", 0);
+    test(S(""), 0, 1, "abcde", -5);
+    test(S(""), 0, 1, "abcdefghij", -10);
+    test(S(""), 0, 1, "abcdefghijklmnopqrst", -20);
+    test(S(""), 1, 0, "", 0);
+    test(S(""), 1, 0, "abcde", 0);
+    test(S(""), 1, 0, "abcdefghij", 0);
+    test(S(""), 1, 0, "abcdefghijklmnopqrst", 0);
+    test(S("abcde"), 0, 0, "", 0);
+    test(S("abcde"), 0, 0, "abcde", -5);
+    test(S("abcde"), 0, 0, "abcdefghij", -10);
+    test(S("abcde"), 0, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcde"), 0, 1, "", 1);
+    test(S("abcde"), 0, 1, "abcde", -4);
+    test(S("abcde"), 0, 1, "abcdefghij", -9);
+    test(S("abcde"), 0, 1, "abcdefghijklmnopqrst", -19);
+    test(S("abcde"), 0, 2, "", 2);
+    test(S("abcde"), 0, 2, "abcde", -3);
+    test(S("abcde"), 0, 2, "abcdefghij", -8);
+    test(S("abcde"), 0, 2, "abcdefghijklmnopqrst", -18);
+    test(S("abcde"), 0, 4, "", 4);
+    test(S("abcde"), 0, 4, "abcde", -1);
+    test(S("abcde"), 0, 4, "abcdefghij", -6);
+    test(S("abcde"), 0, 4, "abcdefghijklmnopqrst", -16);
+    test(S("abcde"), 0, 5, "", 5);
+    test(S("abcde"), 0, 5, "abcde", 0);
+    test(S("abcde"), 0, 5, "abcdefghij", -5);
+    test(S("abcde"), 0, 5, "abcdefghijklmnopqrst", -15);
+    test(S("abcde"), 0, 6, "", 5);
+    test(S("abcde"), 0, 6, "abcde", 0);
+    test(S("abcde"), 0, 6, "abcdefghij", -5);
+    test(S("abcde"), 0, 6, "abcdefghijklmnopqrst", -15);
+    test(S("abcde"), 1, 0, "", 0);
+    test(S("abcde"), 1, 0, "abcde", -5);
+    test(S("abcde"), 1, 0, "abcdefghij", -10);
+    test(S("abcde"), 1, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcde"), 1, 1, "", 1);
+    test(S("abcde"), 1, 1, "abcde", 1);
+    test(S("abcde"), 1, 1, "abcdefghij", 1);
+    test(S("abcde"), 1, 1, "abcdefghijklmnopqrst", 1);
+    test(S("abcde"), 1, 2, "", 2);
+    test(S("abcde"), 1, 2, "abcde", 1);
+    test(S("abcde"), 1, 2, "abcdefghij", 1);
+    test(S("abcde"), 1, 2, "abcdefghijklmnopqrst", 1);
+    test(S("abcde"), 1, 3, "", 3);
+    test(S("abcde"), 1, 3, "abcde", 1);
+    test(S("abcde"), 1, 3, "abcdefghij", 1);
+    test(S("abcde"), 1, 3, "abcdefghijklmnopqrst", 1);
+    test(S("abcde"), 1, 4, "", 4);
+    test(S("abcde"), 1, 4, "abcde", 1);
+    test(S("abcde"), 1, 4, "abcdefghij", 1);
+    test(S("abcde"), 1, 4, "abcdefghijklmnopqrst", 1);
+    test(S("abcde"), 1, 5, "", 4);
+    test(S("abcde"), 1, 5, "abcde", 1);
+    test(S("abcde"), 1, 5, "abcdefghij", 1);
+    test(S("abcde"), 1, 5, "abcdefghijklmnopqrst", 1);
+    test(S("abcde"), 2, 0, "", 0);
+    test(S("abcde"), 2, 0, "abcde", -5);
+    test(S("abcde"), 2, 0, "abcdefghij", -10);
+    test(S("abcde"), 2, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcde"), 2, 1, "", 1);
+    test(S("abcde"), 2, 1, "abcde", 2);
+    test(S("abcde"), 2, 1, "abcdefghij", 2);
+    test(S("abcde"), 2, 1, "abcdefghijklmnopqrst", 2);
+    test(S("abcde"), 2, 2, "", 2);
+    test(S("abcde"), 2, 2, "abcde", 2);
+    test(S("abcde"), 2, 2, "abcdefghij", 2);
+    test(S("abcde"), 2, 2, "abcdefghijklmnopqrst", 2);
+    test(S("abcde"), 2, 3, "", 3);
+    test(S("abcde"), 2, 3, "abcde", 2);
+    test(S("abcde"), 2, 3, "abcdefghij", 2);
+    test(S("abcde"), 2, 3, "abcdefghijklmnopqrst", 2);
+    test(S("abcde"), 2, 4, "", 3);
+    test(S("abcde"), 2, 4, "abcde", 2);
+    test(S("abcde"), 2, 4, "abcdefghij", 2);
+    test(S("abcde"), 2, 4, "abcdefghijklmnopqrst", 2);
+    test(S("abcde"), 4, 0, "", 0);
+    test(S("abcde"), 4, 0, "abcde", -5);
+    test(S("abcde"), 4, 0, "abcdefghij", -10);
+    test(S("abcde"), 4, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcde"), 4, 1, "", 1);
+    test(S("abcde"), 4, 1, "abcde", 4);
+    test(S("abcde"), 4, 1, "abcdefghij", 4);
+    test(S("abcde"), 4, 1, "abcdefghijklmnopqrst", 4);
+    test(S("abcde"), 4, 2, "", 1);
+    test(S("abcde"), 4, 2, "abcde", 4);
+    test(S("abcde"), 4, 2, "abcdefghij", 4);
+    test(S("abcde"), 4, 2, "abcdefghijklmnopqrst", 4);
+    test(S("abcde"), 5, 0, "", 0);
+    test(S("abcde"), 5, 0, "abcde", -5);
+    test(S("abcde"), 5, 0, "abcdefghij", -10);
+    test(S("abcde"), 5, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcde"), 5, 1, "", 0);
+    test(S("abcde"), 5, 1, "abcde", -5);
+    test(S("abcde"), 5, 1, "abcdefghij", -10);
+    test(S("abcde"), 5, 1, "abcdefghijklmnopqrst", -20);
+}
+
+template <class S>
+void test1()
+{
+    test(S("abcde"), 6, 0, "", 0);
+    test(S("abcde"), 6, 0, "abcde", 0);
+    test(S("abcde"), 6, 0, "abcdefghij", 0);
+    test(S("abcde"), 6, 0, "abcdefghijklmnopqrst", 0);
+    test(S("abcdefghij"), 0, 0, "", 0);
+    test(S("abcdefghij"), 0, 0, "abcde", -5);
+    test(S("abcdefghij"), 0, 0, "abcdefghij", -10);
+    test(S("abcdefghij"), 0, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghij"), 0, 1, "", 1);
+    test(S("abcdefghij"), 0, 1, "abcde", -4);
+    test(S("abcdefghij"), 0, 1, "abcdefghij", -9);
+    test(S("abcdefghij"), 0, 1, "abcdefghijklmnopqrst", -19);
+    test(S("abcdefghij"), 0, 5, "", 5);
+    test(S("abcdefghij"), 0, 5, "abcde", 0);
+    test(S("abcdefghij"), 0, 5, "abcdefghij", -5);
+    test(S("abcdefghij"), 0, 5, "abcdefghijklmnopqrst", -15);
+    test(S("abcdefghij"), 0, 9, "", 9);
+    test(S("abcdefghij"), 0, 9, "abcde", 4);
+    test(S("abcdefghij"), 0, 9, "abcdefghij", -1);
+    test(S("abcdefghij"), 0, 9, "abcdefghijklmnopqrst", -11);
+    test(S("abcdefghij"), 0, 10, "", 10);
+    test(S("abcdefghij"), 0, 10, "abcde", 5);
+    test(S("abcdefghij"), 0, 10, "abcdefghij", 0);
+    test(S("abcdefghij"), 0, 10, "abcdefghijklmnopqrst", -10);
+    test(S("abcdefghij"), 0, 11, "", 10);
+    test(S("abcdefghij"), 0, 11, "abcde", 5);
+    test(S("abcdefghij"), 0, 11, "abcdefghij", 0);
+    test(S("abcdefghij"), 0, 11, "abcdefghijklmnopqrst", -10);
+    test(S("abcdefghij"), 1, 0, "", 0);
+    test(S("abcdefghij"), 1, 0, "abcde", -5);
+    test(S("abcdefghij"), 1, 0, "abcdefghij", -10);
+    test(S("abcdefghij"), 1, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghij"), 1, 1, "", 1);
+    test(S("abcdefghij"), 1, 1, "abcde", 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghij", 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghij"), 1, 4, "", 4);
+    test(S("abcdefghij"), 1, 4, "abcde", 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghij", 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghij"), 1, 8, "", 8);
+    test(S("abcdefghij"), 1, 8, "abcde", 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghij", 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghij"), 1, 9, "", 9);
+    test(S("abcdefghij"), 1, 9, "abcde", 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghij", 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghij"), 1, 10, "", 9);
+    test(S("abcdefghij"), 1, 10, "abcde", 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghij", 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghij"), 5, 0, "", 0);
+    test(S("abcdefghij"), 5, 0, "abcde", -5);
+    test(S("abcdefghij"), 5, 0, "abcdefghij", -10);
+    test(S("abcdefghij"), 5, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghij"), 5, 1, "", 1);
+    test(S("abcdefghij"), 5, 1, "abcde", 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghij", 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghijklmnopqrst", 5);
+    test(S("abcdefghij"), 5, 2, "", 2);
+    test(S("abcdefghij"), 5, 2, "abcde", 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghij", 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghijklmnopqrst", 5);
+    test(S("abcdefghij"), 5, 4, "", 4);
+    test(S("abcdefghij"), 5, 4, "abcde", 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghij", 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghijklmnopqrst", 5);
+    test(S("abcdefghij"), 5, 5, "", 5);
+    test(S("abcdefghij"), 5, 5, "abcde", 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghij", 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghijklmnopqrst", 5);
+    test(S("abcdefghij"), 5, 6, "", 5);
+    test(S("abcdefghij"), 5, 6, "abcde", 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghij", 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghijklmnopqrst", 5);
+    test(S("abcdefghij"), 9, 0, "", 0);
+    test(S("abcdefghij"), 9, 0, "abcde", -5);
+    test(S("abcdefghij"), 9, 0, "abcdefghij", -10);
+    test(S("abcdefghij"), 9, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghij"), 9, 1, "", 1);
+    test(S("abcdefghij"), 9, 1, "abcde", 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghij", 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghijklmnopqrst", 9);
+    test(S("abcdefghij"), 9, 2, "", 1);
+    test(S("abcdefghij"), 9, 2, "abcde", 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghij", 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghijklmnopqrst", 9);
+    test(S("abcdefghij"), 10, 0, "", 0);
+    test(S("abcdefghij"), 10, 0, "abcde", -5);
+    test(S("abcdefghij"), 10, 0, "abcdefghij", -10);
+    test(S("abcdefghij"), 10, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghij"), 10, 1, "", 0);
+    test(S("abcdefghij"), 10, 1, "abcde", -5);
+    test(S("abcdefghij"), 10, 1, "abcdefghij", -10);
+    test(S("abcdefghij"), 10, 1, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghij"), 11, 0, "", 0);
+    test(S("abcdefghij"), 11, 0, "abcde", 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghij", 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghijklmnopqrst", 0);
+}
+
+template <class S>
+void test2()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 0, "", 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcde", -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghij", -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "", 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcde", -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghij", -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghijklmnopqrst", -19);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "", 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcde", 5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghij", 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghijklmnopqrst", -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "", 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcde", 14);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghij", 9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghijklmnopqrst", -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "", 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcde", 15);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghijklmnopqrst", 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "", 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcde", 15);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghijklmnopqrst", 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "", 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcde", -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghij", -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcde", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghij", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "", 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcde", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghij", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "", 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcde", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghij", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "", 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcde", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghij", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "", 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcde", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghij", 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghijklmnopqrst", 1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "", 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcde", -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghij", -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "", 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcde", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghijklmnopqrst", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "", 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcde", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghijklmnopqrst", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "", 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcde", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghijklmnopqrst", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcde", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghijklmnopqrst", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcde", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghij", 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghijklmnopqrst", 10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "", 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcde", -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghij", -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "", 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcde", 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghij", 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghijklmnopqrst", 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "", 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcde", 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghij", 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghijklmnopqrst", 19);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "", 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcde", -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghij", -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "", 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcde", -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghij", -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghijklmnopqrst", -20);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "", 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcde", 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghij", 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 0);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    }
+#endif
+}
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
new file mode 100644
index 00000000000..ee804d9cc6e
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
@@ -0,0 +1,1323 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// int compare(size_type pos, size_type n1, const charT *s, size_type n2) const;
+
+#include <string>
+#include <stdexcept>
+#include <cassert>
+
+#include "min_allocator.h"
+
+int sign(int x)
+{
+    if (x == 0)
+        return 0;
+    if (x < 0)
+        return -1;
+    return 1;
+}
+
+template <class S>
+void
+test(const S& s, typename S::size_type pos, typename S::size_type n1,
+     const typename S::value_type* str, typename S::size_type n2, int x)
+{
+    try
+    {
+        assert(sign(s.compare(pos, n1, str, n2)) == sign(x));
+        assert(pos <= s.size());
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos > s.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), 0, 0, "", 0, 0);
+    test(S(""), 0, 0, "abcde", 0, 0);
+    test(S(""), 0, 0, "abcde", 1, -1);
+    test(S(""), 0, 0, "abcde", 2, -2);
+    test(S(""), 0, 0, "abcde", 4, -4);
+    test(S(""), 0, 0, "abcde", 5, -5);
+    test(S(""), 0, 0, "abcdefghij", 0, 0);
+    test(S(""), 0, 0, "abcdefghij", 1, -1);
+    test(S(""), 0, 0, "abcdefghij", 5, -5);
+    test(S(""), 0, 0, "abcdefghij", 9, -9);
+    test(S(""), 0, 0, "abcdefghij", 10, -10);
+    test(S(""), 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S(""), 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S(""), 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S(""), 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S(""), 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S(""), 0, 1, "", 0, 0);
+    test(S(""), 0, 1, "abcde", 0, 0);
+    test(S(""), 0, 1, "abcde", 1, -1);
+    test(S(""), 0, 1, "abcde", 2, -2);
+    test(S(""), 0, 1, "abcde", 4, -4);
+    test(S(""), 0, 1, "abcde", 5, -5);
+    test(S(""), 0, 1, "abcdefghij", 0, 0);
+    test(S(""), 0, 1, "abcdefghij", 1, -1);
+    test(S(""), 0, 1, "abcdefghij", 5, -5);
+    test(S(""), 0, 1, "abcdefghij", 9, -9);
+    test(S(""), 0, 1, "abcdefghij", 10, -10);
+    test(S(""), 0, 1, "abcdefghijklmnopqrst", 0, 0);
+    test(S(""), 0, 1, "abcdefghijklmnopqrst", 1, -1);
+    test(S(""), 0, 1, "abcdefghijklmnopqrst", 10, -10);
+    test(S(""), 0, 1, "abcdefghijklmnopqrst", 19, -19);
+    test(S(""), 0, 1, "abcdefghijklmnopqrst", 20, -20);
+    test(S(""), 1, 0, "", 0, 0);
+    test(S(""), 1, 0, "abcde", 0, 0);
+    test(S(""), 1, 0, "abcde", 1, 0);
+    test(S(""), 1, 0, "abcde", 2, 0);
+    test(S(""), 1, 0, "abcde", 4, 0);
+    test(S(""), 1, 0, "abcde", 5, 0);
+    test(S(""), 1, 0, "abcdefghij", 0, 0);
+    test(S(""), 1, 0, "abcdefghij", 1, 0);
+    test(S(""), 1, 0, "abcdefghij", 5, 0);
+    test(S(""), 1, 0, "abcdefghij", 9, 0);
+    test(S(""), 1, 0, "abcdefghij", 10, 0);
+    test(S(""), 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S(""), 1, 0, "abcdefghijklmnopqrst", 1, 0);
+    test(S(""), 1, 0, "abcdefghijklmnopqrst", 10, 0);
+    test(S(""), 1, 0, "abcdefghijklmnopqrst", 19, 0);
+    test(S(""), 1, 0, "abcdefghijklmnopqrst", 20, 0);
+    test(S("abcde"), 0, 0, "", 0, 0);
+    test(S("abcde"), 0, 0, "abcde", 0, 0);
+    test(S("abcde"), 0, 0, "abcde", 1, -1);
+    test(S("abcde"), 0, 0, "abcde", 2, -2);
+    test(S("abcde"), 0, 0, "abcde", 4, -4);
+    test(S("abcde"), 0, 0, "abcde", 5, -5);
+    test(S("abcde"), 0, 0, "abcdefghij", 0, 0);
+    test(S("abcde"), 0, 0, "abcdefghij", 1, -1);
+    test(S("abcde"), 0, 0, "abcdefghij", 5, -5);
+    test(S("abcde"), 0, 0, "abcdefghij", 9, -9);
+    test(S("abcde"), 0, 0, "abcdefghij", 10, -10);
+    test(S("abcde"), 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcde"), 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcde"), 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcde"), 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcde"), 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcde"), 0, 1, "", 0, 1);
+    test(S("abcde"), 0, 1, "abcde", 0, 1);
+    test(S("abcde"), 0, 1, "abcde", 1, 0);
+    test(S("abcde"), 0, 1, "abcde", 2, -1);
+    test(S("abcde"), 0, 1, "abcde", 4, -3);
+    test(S("abcde"), 0, 1, "abcde", 5, -4);
+    test(S("abcde"), 0, 1, "abcdefghij", 0, 1);
+    test(S("abcde"), 0, 1, "abcdefghij", 1, 0);
+    test(S("abcde"), 0, 1, "abcdefghij", 5, -4);
+    test(S("abcde"), 0, 1, "abcdefghij", 9, -8);
+    test(S("abcde"), 0, 1, "abcdefghij", 10, -9);
+    test(S("abcde"), 0, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcde"), 0, 1, "abcdefghijklmnopqrst", 1, 0);
+    test(S("abcde"), 0, 1, "abcdefghijklmnopqrst", 10, -9);
+    test(S("abcde"), 0, 1, "abcdefghijklmnopqrst", 19, -18);
+    test(S("abcde"), 0, 1, "abcdefghijklmnopqrst", 20, -19);
+    test(S("abcde"), 0, 2, "", 0, 2);
+    test(S("abcde"), 0, 2, "abcde", 0, 2);
+    test(S("abcde"), 0, 2, "abcde", 1, 1);
+    test(S("abcde"), 0, 2, "abcde", 2, 0);
+    test(S("abcde"), 0, 2, "abcde", 4, -2);
+    test(S("abcde"), 0, 2, "abcde", 5, -3);
+    test(S("abcde"), 0, 2, "abcdefghij", 0, 2);
+    test(S("abcde"), 0, 2, "abcdefghij", 1, 1);
+    test(S("abcde"), 0, 2, "abcdefghij", 5, -3);
+    test(S("abcde"), 0, 2, "abcdefghij", 9, -7);
+    test(S("abcde"), 0, 2, "abcdefghij", 10, -8);
+    test(S("abcde"), 0, 2, "abcdefghijklmnopqrst", 0, 2);
+    test(S("abcde"), 0, 2, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcde"), 0, 2, "abcdefghijklmnopqrst", 10, -8);
+    test(S("abcde"), 0, 2, "abcdefghijklmnopqrst", 19, -17);
+    test(S("abcde"), 0, 2, "abcdefghijklmnopqrst", 20, -18);
+    test(S("abcde"), 0, 4, "", 0, 4);
+    test(S("abcde"), 0, 4, "abcde", 0, 4);
+    test(S("abcde"), 0, 4, "abcde", 1, 3);
+    test(S("abcde"), 0, 4, "abcde", 2, 2);
+}
+
+template <class S>
+void test1()
+{
+    test(S("abcde"), 0, 4, "abcde", 4, 0);
+    test(S("abcde"), 0, 4, "abcde", 5, -1);
+    test(S("abcde"), 0, 4, "abcdefghij", 0, 4);
+    test(S("abcde"), 0, 4, "abcdefghij", 1, 3);
+    test(S("abcde"), 0, 4, "abcdefghij", 5, -1);
+    test(S("abcde"), 0, 4, "abcdefghij", 9, -5);
+    test(S("abcde"), 0, 4, "abcdefghij", 10, -6);
+    test(S("abcde"), 0, 4, "abcdefghijklmnopqrst", 0, 4);
+    test(S("abcde"), 0, 4, "abcdefghijklmnopqrst", 1, 3);
+    test(S("abcde"), 0, 4, "abcdefghijklmnopqrst", 10, -6);
+    test(S("abcde"), 0, 4, "abcdefghijklmnopqrst", 19, -15);
+    test(S("abcde"), 0, 4, "abcdefghijklmnopqrst", 20, -16);
+    test(S("abcde"), 0, 5, "", 0, 5);
+    test(S("abcde"), 0, 5, "abcde", 0, 5);
+    test(S("abcde"), 0, 5, "abcde", 1, 4);
+    test(S("abcde"), 0, 5, "abcde", 2, 3);
+    test(S("abcde"), 0, 5, "abcde", 4, 1);
+    test(S("abcde"), 0, 5, "abcde", 5, 0);
+    test(S("abcde"), 0, 5, "abcdefghij", 0, 5);
+    test(S("abcde"), 0, 5, "abcdefghij", 1, 4);
+    test(S("abcde"), 0, 5, "abcdefghij", 5, 0);
+    test(S("abcde"), 0, 5, "abcdefghij", 9, -4);
+    test(S("abcde"), 0, 5, "abcdefghij", 10, -5);
+    test(S("abcde"), 0, 5, "abcdefghijklmnopqrst", 0, 5);
+    test(S("abcde"), 0, 5, "abcdefghijklmnopqrst", 1, 4);
+    test(S("abcde"), 0, 5, "abcdefghijklmnopqrst", 10, -5);
+    test(S("abcde"), 0, 5, "abcdefghijklmnopqrst", 19, -14);
+    test(S("abcde"), 0, 5, "abcdefghijklmnopqrst", 20, -15);
+    test(S("abcde"), 0, 6, "", 0, 5);
+    test(S("abcde"), 0, 6, "abcde", 0, 5);
+    test(S("abcde"), 0, 6, "abcde", 1, 4);
+    test(S("abcde"), 0, 6, "abcde", 2, 3);
+    test(S("abcde"), 0, 6, "abcde", 4, 1);
+    test(S("abcde"), 0, 6, "abcde", 5, 0);
+    test(S("abcde"), 0, 6, "abcdefghij", 0, 5);
+    test(S("abcde"), 0, 6, "abcdefghij", 1, 4);
+    test(S("abcde"), 0, 6, "abcdefghij", 5, 0);
+    test(S("abcde"), 0, 6, "abcdefghij", 9, -4);
+    test(S("abcde"), 0, 6, "abcdefghij", 10, -5);
+    test(S("abcde"), 0, 6, "abcdefghijklmnopqrst", 0, 5);
+    test(S("abcde"), 0, 6, "abcdefghijklmnopqrst", 1, 4);
+    test(S("abcde"), 0, 6, "abcdefghijklmnopqrst", 10, -5);
+    test(S("abcde"), 0, 6, "abcdefghijklmnopqrst", 19, -14);
+    test(S("abcde"), 0, 6, "abcdefghijklmnopqrst", 20, -15);
+    test(S("abcde"), 1, 0, "", 0, 0);
+    test(S("abcde"), 1, 0, "abcde", 0, 0);
+    test(S("abcde"), 1, 0, "abcde", 1, -1);
+    test(S("abcde"), 1, 0, "abcde", 2, -2);
+    test(S("abcde"), 1, 0, "abcde", 4, -4);
+    test(S("abcde"), 1, 0, "abcde", 5, -5);
+    test(S("abcde"), 1, 0, "abcdefghij", 0, 0);
+    test(S("abcde"), 1, 0, "abcdefghij", 1, -1);
+    test(S("abcde"), 1, 0, "abcdefghij", 5, -5);
+    test(S("abcde"), 1, 0, "abcdefghij", 9, -9);
+    test(S("abcde"), 1, 0, "abcdefghij", 10, -10);
+    test(S("abcde"), 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcde"), 1, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcde"), 1, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcde"), 1, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcde"), 1, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcde"), 1, 1, "", 0, 1);
+    test(S("abcde"), 1, 1, "abcde", 0, 1);
+    test(S("abcde"), 1, 1, "abcde", 1, 1);
+    test(S("abcde"), 1, 1, "abcde", 2, 1);
+    test(S("abcde"), 1, 1, "abcde", 4, 1);
+    test(S("abcde"), 1, 1, "abcde", 5, 1);
+    test(S("abcde"), 1, 1, "abcdefghij", 0, 1);
+    test(S("abcde"), 1, 1, "abcdefghij", 1, 1);
+    test(S("abcde"), 1, 1, "abcdefghij", 5, 1);
+    test(S("abcde"), 1, 1, "abcdefghij", 9, 1);
+    test(S("abcde"), 1, 1, "abcdefghij", 10, 1);
+    test(S("abcde"), 1, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcde"), 1, 1, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcde"), 1, 1, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcde"), 1, 1, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcde"), 1, 1, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcde"), 1, 2, "", 0, 2);
+    test(S("abcde"), 1, 2, "abcde", 0, 2);
+    test(S("abcde"), 1, 2, "abcde", 1, 1);
+    test(S("abcde"), 1, 2, "abcde", 2, 1);
+    test(S("abcde"), 1, 2, "abcde", 4, 1);
+    test(S("abcde"), 1, 2, "abcde", 5, 1);
+    test(S("abcde"), 1, 2, "abcdefghij", 0, 2);
+    test(S("abcde"), 1, 2, "abcdefghij", 1, 1);
+    test(S("abcde"), 1, 2, "abcdefghij", 5, 1);
+    test(S("abcde"), 1, 2, "abcdefghij", 9, 1);
+    test(S("abcde"), 1, 2, "abcdefghij", 10, 1);
+    test(S("abcde"), 1, 2, "abcdefghijklmnopqrst", 0, 2);
+    test(S("abcde"), 1, 2, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcde"), 1, 2, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcde"), 1, 2, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcde"), 1, 2, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcde"), 1, 3, "", 0, 3);
+    test(S("abcde"), 1, 3, "abcde", 0, 3);
+    test(S("abcde"), 1, 3, "abcde", 1, 1);
+    test(S("abcde"), 1, 3, "abcde", 2, 1);
+    test(S("abcde"), 1, 3, "abcde", 4, 1);
+    test(S("abcde"), 1, 3, "abcde", 5, 1);
+    test(S("abcde"), 1, 3, "abcdefghij", 0, 3);
+    test(S("abcde"), 1, 3, "abcdefghij", 1, 1);
+}
+
+template <class S>
+void test2()
+{
+    test(S("abcde"), 1, 3, "abcdefghij", 5, 1);
+    test(S("abcde"), 1, 3, "abcdefghij", 9, 1);
+    test(S("abcde"), 1, 3, "abcdefghij", 10, 1);
+    test(S("abcde"), 1, 3, "abcdefghijklmnopqrst", 0, 3);
+    test(S("abcde"), 1, 3, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcde"), 1, 3, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcde"), 1, 3, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcde"), 1, 3, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcde"), 1, 4, "", 0, 4);
+    test(S("abcde"), 1, 4, "abcde", 0, 4);
+    test(S("abcde"), 1, 4, "abcde", 1, 1);
+    test(S("abcde"), 1, 4, "abcde", 2, 1);
+    test(S("abcde"), 1, 4, "abcde", 4, 1);
+    test(S("abcde"), 1, 4, "abcde", 5, 1);
+    test(S("abcde"), 1, 4, "abcdefghij", 0, 4);
+    test(S("abcde"), 1, 4, "abcdefghij", 1, 1);
+    test(S("abcde"), 1, 4, "abcdefghij", 5, 1);
+    test(S("abcde"), 1, 4, "abcdefghij", 9, 1);
+    test(S("abcde"), 1, 4, "abcdefghij", 10, 1);
+    test(S("abcde"), 1, 4, "abcdefghijklmnopqrst", 0, 4);
+    test(S("abcde"), 1, 4, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcde"), 1, 4, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcde"), 1, 4, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcde"), 1, 4, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcde"), 1, 5, "", 0, 4);
+    test(S("abcde"), 1, 5, "abcde", 0, 4);
+    test(S("abcde"), 1, 5, "abcde", 1, 1);
+    test(S("abcde"), 1, 5, "abcde", 2, 1);
+    test(S("abcde"), 1, 5, "abcde", 4, 1);
+    test(S("abcde"), 1, 5, "abcde", 5, 1);
+    test(S("abcde"), 1, 5, "abcdefghij", 0, 4);
+    test(S("abcde"), 1, 5, "abcdefghij", 1, 1);
+    test(S("abcde"), 1, 5, "abcdefghij", 5, 1);
+    test(S("abcde"), 1, 5, "abcdefghij", 9, 1);
+    test(S("abcde"), 1, 5, "abcdefghij", 10, 1);
+    test(S("abcde"), 1, 5, "abcdefghijklmnopqrst", 0, 4);
+    test(S("abcde"), 1, 5, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcde"), 1, 5, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcde"), 1, 5, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcde"), 1, 5, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcde"), 2, 0, "", 0, 0);
+    test(S("abcde"), 2, 0, "abcde", 0, 0);
+    test(S("abcde"), 2, 0, "abcde", 1, -1);
+    test(S("abcde"), 2, 0, "abcde", 2, -2);
+    test(S("abcde"), 2, 0, "abcde", 4, -4);
+    test(S("abcde"), 2, 0, "abcde", 5, -5);
+    test(S("abcde"), 2, 0, "abcdefghij", 0, 0);
+    test(S("abcde"), 2, 0, "abcdefghij", 1, -1);
+    test(S("abcde"), 2, 0, "abcdefghij", 5, -5);
+    test(S("abcde"), 2, 0, "abcdefghij", 9, -9);
+    test(S("abcde"), 2, 0, "abcdefghij", 10, -10);
+    test(S("abcde"), 2, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcde"), 2, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcde"), 2, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcde"), 2, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcde"), 2, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcde"), 2, 1, "", 0, 1);
+    test(S("abcde"), 2, 1, "abcde", 0, 1);
+    test(S("abcde"), 2, 1, "abcde", 1, 2);
+    test(S("abcde"), 2, 1, "abcde", 2, 2);
+    test(S("abcde"), 2, 1, "abcde", 4, 2);
+    test(S("abcde"), 2, 1, "abcde", 5, 2);
+    test(S("abcde"), 2, 1, "abcdefghij", 0, 1);
+    test(S("abcde"), 2, 1, "abcdefghij", 1, 2);
+    test(S("abcde"), 2, 1, "abcdefghij", 5, 2);
+    test(S("abcde"), 2, 1, "abcdefghij", 9, 2);
+    test(S("abcde"), 2, 1, "abcdefghij", 10, 2);
+    test(S("abcde"), 2, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcde"), 2, 1, "abcdefghijklmnopqrst", 1, 2);
+    test(S("abcde"), 2, 1, "abcdefghijklmnopqrst", 10, 2);
+    test(S("abcde"), 2, 1, "abcdefghijklmnopqrst", 19, 2);
+    test(S("abcde"), 2, 1, "abcdefghijklmnopqrst", 20, 2);
+    test(S("abcde"), 2, 2, "", 0, 2);
+    test(S("abcde"), 2, 2, "abcde", 0, 2);
+    test(S("abcde"), 2, 2, "abcde", 1, 2);
+    test(S("abcde"), 2, 2, "abcde", 2, 2);
+    test(S("abcde"), 2, 2, "abcde", 4, 2);
+    test(S("abcde"), 2, 2, "abcde", 5, 2);
+    test(S("abcde"), 2, 2, "abcdefghij", 0, 2);
+    test(S("abcde"), 2, 2, "abcdefghij", 1, 2);
+    test(S("abcde"), 2, 2, "abcdefghij", 5, 2);
+    test(S("abcde"), 2, 2, "abcdefghij", 9, 2);
+    test(S("abcde"), 2, 2, "abcdefghij", 10, 2);
+    test(S("abcde"), 2, 2, "abcdefghijklmnopqrst", 0, 2);
+    test(S("abcde"), 2, 2, "abcdefghijklmnopqrst", 1, 2);
+    test(S("abcde"), 2, 2, "abcdefghijklmnopqrst", 10, 2);
+    test(S("abcde"), 2, 2, "abcdefghijklmnopqrst", 19, 2);
+    test(S("abcde"), 2, 2, "abcdefghijklmnopqrst", 20, 2);
+    test(S("abcde"), 2, 3, "", 0, 3);
+    test(S("abcde"), 2, 3, "abcde", 0, 3);
+    test(S("abcde"), 2, 3, "abcde", 1, 2);
+    test(S("abcde"), 2, 3, "abcde", 2, 2);
+    test(S("abcde"), 2, 3, "abcde", 4, 2);
+    test(S("abcde"), 2, 3, "abcde", 5, 2);
+    test(S("abcde"), 2, 3, "abcdefghij", 0, 3);
+    test(S("abcde"), 2, 3, "abcdefghij", 1, 2);
+    test(S("abcde"), 2, 3, "abcdefghij", 5, 2);
+    test(S("abcde"), 2, 3, "abcdefghij", 9, 2);
+    test(S("abcde"), 2, 3, "abcdefghij", 10, 2);
+    test(S("abcde"), 2, 3, "abcdefghijklmnopqrst", 0, 3);
+}
+
+template <class S>
+void test3()
+{
+    test(S("abcde"), 2, 3, "abcdefghijklmnopqrst", 1, 2);
+    test(S("abcde"), 2, 3, "abcdefghijklmnopqrst", 10, 2);
+    test(S("abcde"), 2, 3, "abcdefghijklmnopqrst", 19, 2);
+    test(S("abcde"), 2, 3, "abcdefghijklmnopqrst", 20, 2);
+    test(S("abcde"), 2, 4, "", 0, 3);
+    test(S("abcde"), 2, 4, "abcde", 0, 3);
+    test(S("abcde"), 2, 4, "abcde", 1, 2);
+    test(S("abcde"), 2, 4, "abcde", 2, 2);
+    test(S("abcde"), 2, 4, "abcde", 4, 2);
+    test(S("abcde"), 2, 4, "abcde", 5, 2);
+    test(S("abcde"), 2, 4, "abcdefghij", 0, 3);
+    test(S("abcde"), 2, 4, "abcdefghij", 1, 2);
+    test(S("abcde"), 2, 4, "abcdefghij", 5, 2);
+    test(S("abcde"), 2, 4, "abcdefghij", 9, 2);
+    test(S("abcde"), 2, 4, "abcdefghij", 10, 2);
+    test(S("abcde"), 2, 4, "abcdefghijklmnopqrst", 0, 3);
+    test(S("abcde"), 2, 4, "abcdefghijklmnopqrst", 1, 2);
+    test(S("abcde"), 2, 4, "abcdefghijklmnopqrst", 10, 2);
+    test(S("abcde"), 2, 4, "abcdefghijklmnopqrst", 19, 2);
+    test(S("abcde"), 2, 4, "abcdefghijklmnopqrst", 20, 2);
+    test(S("abcde"), 4, 0, "", 0, 0);
+    test(S("abcde"), 4, 0, "abcde", 0, 0);
+    test(S("abcde"), 4, 0, "abcde", 1, -1);
+    test(S("abcde"), 4, 0, "abcde", 2, -2);
+    test(S("abcde"), 4, 0, "abcde", 4, -4);
+    test(S("abcde"), 4, 0, "abcde", 5, -5);
+    test(S("abcde"), 4, 0, "abcdefghij", 0, 0);
+    test(S("abcde"), 4, 0, "abcdefghij", 1, -1);
+    test(S("abcde"), 4, 0, "abcdefghij", 5, -5);
+    test(S("abcde"), 4, 0, "abcdefghij", 9, -9);
+    test(S("abcde"), 4, 0, "abcdefghij", 10, -10);
+    test(S("abcde"), 4, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcde"), 4, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcde"), 4, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcde"), 4, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcde"), 4, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcde"), 4, 1, "", 0, 1);
+    test(S("abcde"), 4, 1, "abcde", 0, 1);
+    test(S("abcde"), 4, 1, "abcde", 1, 4);
+    test(S("abcde"), 4, 1, "abcde", 2, 4);
+    test(S("abcde"), 4, 1, "abcde", 4, 4);
+    test(S("abcde"), 4, 1, "abcde", 5, 4);
+    test(S("abcde"), 4, 1, "abcdefghij", 0, 1);
+    test(S("abcde"), 4, 1, "abcdefghij", 1, 4);
+    test(S("abcde"), 4, 1, "abcdefghij", 5, 4);
+    test(S("abcde"), 4, 1, "abcdefghij", 9, 4);
+    test(S("abcde"), 4, 1, "abcdefghij", 10, 4);
+    test(S("abcde"), 4, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcde"), 4, 1, "abcdefghijklmnopqrst", 1, 4);
+    test(S("abcde"), 4, 1, "abcdefghijklmnopqrst", 10, 4);
+    test(S("abcde"), 4, 1, "abcdefghijklmnopqrst", 19, 4);
+    test(S("abcde"), 4, 1, "abcdefghijklmnopqrst", 20, 4);
+    test(S("abcde"), 4, 2, "", 0, 1);
+    test(S("abcde"), 4, 2, "abcde", 0, 1);
+    test(S("abcde"), 4, 2, "abcde", 1, 4);
+    test(S("abcde"), 4, 2, "abcde", 2, 4);
+    test(S("abcde"), 4, 2, "abcde", 4, 4);
+    test(S("abcde"), 4, 2, "abcde", 5, 4);
+    test(S("abcde"), 4, 2, "abcdefghij", 0, 1);
+    test(S("abcde"), 4, 2, "abcdefghij", 1, 4);
+    test(S("abcde"), 4, 2, "abcdefghij", 5, 4);
+    test(S("abcde"), 4, 2, "abcdefghij", 9, 4);
+    test(S("abcde"), 4, 2, "abcdefghij", 10, 4);
+    test(S("abcde"), 4, 2, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcde"), 4, 2, "abcdefghijklmnopqrst", 1, 4);
+    test(S("abcde"), 4, 2, "abcdefghijklmnopqrst", 10, 4);
+    test(S("abcde"), 4, 2, "abcdefghijklmnopqrst", 19, 4);
+    test(S("abcde"), 4, 2, "abcdefghijklmnopqrst", 20, 4);
+    test(S("abcde"), 5, 0, "", 0, 0);
+    test(S("abcde"), 5, 0, "abcde", 0, 0);
+    test(S("abcde"), 5, 0, "abcde", 1, -1);
+    test(S("abcde"), 5, 0, "abcde", 2, -2);
+    test(S("abcde"), 5, 0, "abcde", 4, -4);
+    test(S("abcde"), 5, 0, "abcde", 5, -5);
+    test(S("abcde"), 5, 0, "abcdefghij", 0, 0);
+    test(S("abcde"), 5, 0, "abcdefghij", 1, -1);
+    test(S("abcde"), 5, 0, "abcdefghij", 5, -5);
+    test(S("abcde"), 5, 0, "abcdefghij", 9, -9);
+    test(S("abcde"), 5, 0, "abcdefghij", 10, -10);
+    test(S("abcde"), 5, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcde"), 5, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcde"), 5, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcde"), 5, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcde"), 5, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcde"), 5, 1, "", 0, 0);
+    test(S("abcde"), 5, 1, "abcde", 0, 0);
+    test(S("abcde"), 5, 1, "abcde", 1, -1);
+    test(S("abcde"), 5, 1, "abcde", 2, -2);
+    test(S("abcde"), 5, 1, "abcde", 4, -4);
+    test(S("abcde"), 5, 1, "abcde", 5, -5);
+    test(S("abcde"), 5, 1, "abcdefghij", 0, 0);
+    test(S("abcde"), 5, 1, "abcdefghij", 1, -1);
+    test(S("abcde"), 5, 1, "abcdefghij", 5, -5);
+    test(S("abcde"), 5, 1, "abcdefghij", 9, -9);
+    test(S("abcde"), 5, 1, "abcdefghij", 10, -10);
+    test(S("abcde"), 5, 1, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcde"), 5, 1, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcde"), 5, 1, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcde"), 5, 1, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcde"), 5, 1, "abcdefghijklmnopqrst", 20, -20);
+}
+
+template <class S>
+void test4()
+{
+    test(S("abcde"), 6, 0, "", 0, 0);
+    test(S("abcde"), 6, 0, "abcde", 0, 0);
+    test(S("abcde"), 6, 0, "abcde", 1, 0);
+    test(S("abcde"), 6, 0, "abcde", 2, 0);
+    test(S("abcde"), 6, 0, "abcde", 4, 0);
+    test(S("abcde"), 6, 0, "abcde", 5, 0);
+    test(S("abcde"), 6, 0, "abcdefghij", 0, 0);
+    test(S("abcde"), 6, 0, "abcdefghij", 1, 0);
+    test(S("abcde"), 6, 0, "abcdefghij", 5, 0);
+    test(S("abcde"), 6, 0, "abcdefghij", 9, 0);
+    test(S("abcde"), 6, 0, "abcdefghij", 10, 0);
+    test(S("abcde"), 6, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcde"), 6, 0, "abcdefghijklmnopqrst", 1, 0);
+    test(S("abcde"), 6, 0, "abcdefghijklmnopqrst", 10, 0);
+    test(S("abcde"), 6, 0, "abcdefghijklmnopqrst", 19, 0);
+    test(S("abcde"), 6, 0, "abcdefghijklmnopqrst", 20, 0);
+    test(S("abcdefghij"), 0, 0, "", 0, 0);
+    test(S("abcdefghij"), 0, 0, "abcde", 0, 0);
+    test(S("abcdefghij"), 0, 0, "abcde", 1, -1);
+    test(S("abcdefghij"), 0, 0, "abcde", 2, -2);
+    test(S("abcdefghij"), 0, 0, "abcde", 4, -4);
+    test(S("abcdefghij"), 0, 0, "abcde", 5, -5);
+    test(S("abcdefghij"), 0, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghij"), 0, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghij"), 0, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghij"), 0, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghij"), 0, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghij"), 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghij"), 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghij"), 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghij"), 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghij"), 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghij"), 0, 1, "", 0, 1);
+    test(S("abcdefghij"), 0, 1, "abcde", 0, 1);
+    test(S("abcdefghij"), 0, 1, "abcde", 1, 0);
+    test(S("abcdefghij"), 0, 1, "abcde", 2, -1);
+    test(S("abcdefghij"), 0, 1, "abcde", 4, -3);
+    test(S("abcdefghij"), 0, 1, "abcde", 5, -4);
+    test(S("abcdefghij"), 0, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghij"), 0, 1, "abcdefghij", 1, 0);
+    test(S("abcdefghij"), 0, 1, "abcdefghij", 5, -4);
+    test(S("abcdefghij"), 0, 1, "abcdefghij", 9, -8);
+    test(S("abcdefghij"), 0, 1, "abcdefghij", 10, -9);
+    test(S("abcdefghij"), 0, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghij"), 0, 1, "abcdefghijklmnopqrst", 1, 0);
+    test(S("abcdefghij"), 0, 1, "abcdefghijklmnopqrst", 10, -9);
+    test(S("abcdefghij"), 0, 1, "abcdefghijklmnopqrst", 19, -18);
+    test(S("abcdefghij"), 0, 1, "abcdefghijklmnopqrst", 20, -19);
+    test(S("abcdefghij"), 0, 5, "", 0, 5);
+    test(S("abcdefghij"), 0, 5, "abcde", 0, 5);
+    test(S("abcdefghij"), 0, 5, "abcde", 1, 4);
+    test(S("abcdefghij"), 0, 5, "abcde", 2, 3);
+    test(S("abcdefghij"), 0, 5, "abcde", 4, 1);
+    test(S("abcdefghij"), 0, 5, "abcde", 5, 0);
+    test(S("abcdefghij"), 0, 5, "abcdefghij", 0, 5);
+    test(S("abcdefghij"), 0, 5, "abcdefghij", 1, 4);
+    test(S("abcdefghij"), 0, 5, "abcdefghij", 5, 0);
+    test(S("abcdefghij"), 0, 5, "abcdefghij", 9, -4);
+    test(S("abcdefghij"), 0, 5, "abcdefghij", 10, -5);
+    test(S("abcdefghij"), 0, 5, "abcdefghijklmnopqrst", 0, 5);
+    test(S("abcdefghij"), 0, 5, "abcdefghijklmnopqrst", 1, 4);
+    test(S("abcdefghij"), 0, 5, "abcdefghijklmnopqrst", 10, -5);
+    test(S("abcdefghij"), 0, 5, "abcdefghijklmnopqrst", 19, -14);
+    test(S("abcdefghij"), 0, 5, "abcdefghijklmnopqrst", 20, -15);
+    test(S("abcdefghij"), 0, 9, "", 0, 9);
+    test(S("abcdefghij"), 0, 9, "abcde", 0, 9);
+    test(S("abcdefghij"), 0, 9, "abcde", 1, 8);
+    test(S("abcdefghij"), 0, 9, "abcde", 2, 7);
+    test(S("abcdefghij"), 0, 9, "abcde", 4, 5);
+    test(S("abcdefghij"), 0, 9, "abcde", 5, 4);
+    test(S("abcdefghij"), 0, 9, "abcdefghij", 0, 9);
+    test(S("abcdefghij"), 0, 9, "abcdefghij", 1, 8);
+    test(S("abcdefghij"), 0, 9, "abcdefghij", 5, 4);
+    test(S("abcdefghij"), 0, 9, "abcdefghij", 9, 0);
+    test(S("abcdefghij"), 0, 9, "abcdefghij", 10, -1);
+    test(S("abcdefghij"), 0, 9, "abcdefghijklmnopqrst", 0, 9);
+    test(S("abcdefghij"), 0, 9, "abcdefghijklmnopqrst", 1, 8);
+    test(S("abcdefghij"), 0, 9, "abcdefghijklmnopqrst", 10, -1);
+    test(S("abcdefghij"), 0, 9, "abcdefghijklmnopqrst", 19, -10);
+    test(S("abcdefghij"), 0, 9, "abcdefghijklmnopqrst", 20, -11);
+    test(S("abcdefghij"), 0, 10, "", 0, 10);
+    test(S("abcdefghij"), 0, 10, "abcde", 0, 10);
+    test(S("abcdefghij"), 0, 10, "abcde", 1, 9);
+    test(S("abcdefghij"), 0, 10, "abcde", 2, 8);
+    test(S("abcdefghij"), 0, 10, "abcde", 4, 6);
+    test(S("abcdefghij"), 0, 10, "abcde", 5, 5);
+    test(S("abcdefghij"), 0, 10, "abcdefghij", 0, 10);
+    test(S("abcdefghij"), 0, 10, "abcdefghij", 1, 9);
+    test(S("abcdefghij"), 0, 10, "abcdefghij", 5, 5);
+    test(S("abcdefghij"), 0, 10, "abcdefghij", 9, 1);
+    test(S("abcdefghij"), 0, 10, "abcdefghij", 10, 0);
+    test(S("abcdefghij"), 0, 10, "abcdefghijklmnopqrst", 0, 10);
+    test(S("abcdefghij"), 0, 10, "abcdefghijklmnopqrst", 1, 9);
+    test(S("abcdefghij"), 0, 10, "abcdefghijklmnopqrst", 10, 0);
+    test(S("abcdefghij"), 0, 10, "abcdefghijklmnopqrst", 19, -9);
+    test(S("abcdefghij"), 0, 10, "abcdefghijklmnopqrst", 20, -10);
+    test(S("abcdefghij"), 0, 11, "", 0, 10);
+    test(S("abcdefghij"), 0, 11, "abcde", 0, 10);
+    test(S("abcdefghij"), 0, 11, "abcde", 1, 9);
+    test(S("abcdefghij"), 0, 11, "abcde", 2, 8);
+}
+
+template <class S>
+void test5()
+{
+    test(S("abcdefghij"), 0, 11, "abcde", 4, 6);
+    test(S("abcdefghij"), 0, 11, "abcde", 5, 5);
+    test(S("abcdefghij"), 0, 11, "abcdefghij", 0, 10);
+    test(S("abcdefghij"), 0, 11, "abcdefghij", 1, 9);
+    test(S("abcdefghij"), 0, 11, "abcdefghij", 5, 5);
+    test(S("abcdefghij"), 0, 11, "abcdefghij", 9, 1);
+    test(S("abcdefghij"), 0, 11, "abcdefghij", 10, 0);
+    test(S("abcdefghij"), 0, 11, "abcdefghijklmnopqrst", 0, 10);
+    test(S("abcdefghij"), 0, 11, "abcdefghijklmnopqrst", 1, 9);
+    test(S("abcdefghij"), 0, 11, "abcdefghijklmnopqrst", 10, 0);
+    test(S("abcdefghij"), 0, 11, "abcdefghijklmnopqrst", 19, -9);
+    test(S("abcdefghij"), 0, 11, "abcdefghijklmnopqrst", 20, -10);
+    test(S("abcdefghij"), 1, 0, "", 0, 0);
+    test(S("abcdefghij"), 1, 0, "abcde", 0, 0);
+    test(S("abcdefghij"), 1, 0, "abcde", 1, -1);
+    test(S("abcdefghij"), 1, 0, "abcde", 2, -2);
+    test(S("abcdefghij"), 1, 0, "abcde", 4, -4);
+    test(S("abcdefghij"), 1, 0, "abcde", 5, -5);
+    test(S("abcdefghij"), 1, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghij"), 1, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghij"), 1, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghij"), 1, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghij"), 1, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghij"), 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghij"), 1, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghij"), 1, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghij"), 1, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghij"), 1, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghij"), 1, 1, "", 0, 1);
+    test(S("abcdefghij"), 1, 1, "abcde", 0, 1);
+    test(S("abcdefghij"), 1, 1, "abcde", 1, 1);
+    test(S("abcdefghij"), 1, 1, "abcde", 2, 1);
+    test(S("abcdefghij"), 1, 1, "abcde", 4, 1);
+    test(S("abcdefghij"), 1, 1, "abcde", 5, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghij", 1, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghij", 5, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghij", 9, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghij", 10, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghij"), 1, 1, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghij"), 1, 4, "", 0, 4);
+    test(S("abcdefghij"), 1, 4, "abcde", 0, 4);
+    test(S("abcdefghij"), 1, 4, "abcde", 1, 1);
+    test(S("abcdefghij"), 1, 4, "abcde", 2, 1);
+    test(S("abcdefghij"), 1, 4, "abcde", 4, 1);
+    test(S("abcdefghij"), 1, 4, "abcde", 5, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghij", 0, 4);
+    test(S("abcdefghij"), 1, 4, "abcdefghij", 1, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghij", 5, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghij", 9, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghij", 10, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghijklmnopqrst", 0, 4);
+    test(S("abcdefghij"), 1, 4, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghij"), 1, 4, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghij"), 1, 8, "", 0, 8);
+    test(S("abcdefghij"), 1, 8, "abcde", 0, 8);
+    test(S("abcdefghij"), 1, 8, "abcde", 1, 1);
+    test(S("abcdefghij"), 1, 8, "abcde", 2, 1);
+    test(S("abcdefghij"), 1, 8, "abcde", 4, 1);
+    test(S("abcdefghij"), 1, 8, "abcde", 5, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghij", 0, 8);
+    test(S("abcdefghij"), 1, 8, "abcdefghij", 1, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghij", 5, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghij", 9, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghij", 10, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghijklmnopqrst", 0, 8);
+    test(S("abcdefghij"), 1, 8, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghij"), 1, 8, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghij"), 1, 9, "", 0, 9);
+    test(S("abcdefghij"), 1, 9, "abcde", 0, 9);
+    test(S("abcdefghij"), 1, 9, "abcde", 1, 1);
+    test(S("abcdefghij"), 1, 9, "abcde", 2, 1);
+    test(S("abcdefghij"), 1, 9, "abcde", 4, 1);
+    test(S("abcdefghij"), 1, 9, "abcde", 5, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghij", 0, 9);
+    test(S("abcdefghij"), 1, 9, "abcdefghij", 1, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghij", 5, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghij", 9, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghij", 10, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghijklmnopqrst", 0, 9);
+    test(S("abcdefghij"), 1, 9, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghij"), 1, 9, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghij"), 1, 10, "", 0, 9);
+    test(S("abcdefghij"), 1, 10, "abcde", 0, 9);
+    test(S("abcdefghij"), 1, 10, "abcde", 1, 1);
+    test(S("abcdefghij"), 1, 10, "abcde", 2, 1);
+    test(S("abcdefghij"), 1, 10, "abcde", 4, 1);
+    test(S("abcdefghij"), 1, 10, "abcde", 5, 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghij", 0, 9);
+    test(S("abcdefghij"), 1, 10, "abcdefghij", 1, 1);
+}
+
+template <class S>
+void test6()
+{
+    test(S("abcdefghij"), 1, 10, "abcdefghij", 5, 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghij", 9, 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghij", 10, 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghijklmnopqrst", 0, 9);
+    test(S("abcdefghij"), 1, 10, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghij"), 1, 10, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghij"), 5, 0, "", 0, 0);
+    test(S("abcdefghij"), 5, 0, "abcde", 0, 0);
+    test(S("abcdefghij"), 5, 0, "abcde", 1, -1);
+    test(S("abcdefghij"), 5, 0, "abcde", 2, -2);
+    test(S("abcdefghij"), 5, 0, "abcde", 4, -4);
+    test(S("abcdefghij"), 5, 0, "abcde", 5, -5);
+    test(S("abcdefghij"), 5, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghij"), 5, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghij"), 5, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghij"), 5, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghij"), 5, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghij"), 5, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghij"), 5, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghij"), 5, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghij"), 5, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghij"), 5, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghij"), 5, 1, "", 0, 1);
+    test(S("abcdefghij"), 5, 1, "abcde", 0, 1);
+    test(S("abcdefghij"), 5, 1, "abcde", 1, 5);
+    test(S("abcdefghij"), 5, 1, "abcde", 2, 5);
+    test(S("abcdefghij"), 5, 1, "abcde", 4, 5);
+    test(S("abcdefghij"), 5, 1, "abcde", 5, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghij"), 5, 1, "abcdefghij", 1, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghij", 5, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghij", 9, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghij", 10, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghij"), 5, 1, "abcdefghijklmnopqrst", 1, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghijklmnopqrst", 10, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghijklmnopqrst", 19, 5);
+    test(S("abcdefghij"), 5, 1, "abcdefghijklmnopqrst", 20, 5);
+    test(S("abcdefghij"), 5, 2, "", 0, 2);
+    test(S("abcdefghij"), 5, 2, "abcde", 0, 2);
+    test(S("abcdefghij"), 5, 2, "abcde", 1, 5);
+    test(S("abcdefghij"), 5, 2, "abcde", 2, 5);
+    test(S("abcdefghij"), 5, 2, "abcde", 4, 5);
+    test(S("abcdefghij"), 5, 2, "abcde", 5, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghij", 0, 2);
+    test(S("abcdefghij"), 5, 2, "abcdefghij", 1, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghij", 5, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghij", 9, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghij", 10, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghijklmnopqrst", 0, 2);
+    test(S("abcdefghij"), 5, 2, "abcdefghijklmnopqrst", 1, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghijklmnopqrst", 10, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghijklmnopqrst", 19, 5);
+    test(S("abcdefghij"), 5, 2, "abcdefghijklmnopqrst", 20, 5);
+    test(S("abcdefghij"), 5, 4, "", 0, 4);
+    test(S("abcdefghij"), 5, 4, "abcde", 0, 4);
+    test(S("abcdefghij"), 5, 4, "abcde", 1, 5);
+    test(S("abcdefghij"), 5, 4, "abcde", 2, 5);
+    test(S("abcdefghij"), 5, 4, "abcde", 4, 5);
+    test(S("abcdefghij"), 5, 4, "abcde", 5, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghij", 0, 4);
+    test(S("abcdefghij"), 5, 4, "abcdefghij", 1, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghij", 5, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghij", 9, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghij", 10, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghijklmnopqrst", 0, 4);
+    test(S("abcdefghij"), 5, 4, "abcdefghijklmnopqrst", 1, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghijklmnopqrst", 10, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghijklmnopqrst", 19, 5);
+    test(S("abcdefghij"), 5, 4, "abcdefghijklmnopqrst", 20, 5);
+    test(S("abcdefghij"), 5, 5, "", 0, 5);
+    test(S("abcdefghij"), 5, 5, "abcde", 0, 5);
+    test(S("abcdefghij"), 5, 5, "abcde", 1, 5);
+    test(S("abcdefghij"), 5, 5, "abcde", 2, 5);
+    test(S("abcdefghij"), 5, 5, "abcde", 4, 5);
+    test(S("abcdefghij"), 5, 5, "abcde", 5, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghij", 0, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghij", 1, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghij", 5, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghij", 9, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghij", 10, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghijklmnopqrst", 0, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghijklmnopqrst", 1, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghijklmnopqrst", 10, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghijklmnopqrst", 19, 5);
+    test(S("abcdefghij"), 5, 5, "abcdefghijklmnopqrst", 20, 5);
+    test(S("abcdefghij"), 5, 6, "", 0, 5);
+    test(S("abcdefghij"), 5, 6, "abcde", 0, 5);
+    test(S("abcdefghij"), 5, 6, "abcde", 1, 5);
+    test(S("abcdefghij"), 5, 6, "abcde", 2, 5);
+    test(S("abcdefghij"), 5, 6, "abcde", 4, 5);
+    test(S("abcdefghij"), 5, 6, "abcde", 5, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghij", 0, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghij", 1, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghij", 5, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghij", 9, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghij", 10, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghijklmnopqrst", 0, 5);
+}
+
+template <class S>
+void test7()
+{
+    test(S("abcdefghij"), 5, 6, "abcdefghijklmnopqrst", 1, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghijklmnopqrst", 10, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghijklmnopqrst", 19, 5);
+    test(S("abcdefghij"), 5, 6, "abcdefghijklmnopqrst", 20, 5);
+    test(S("abcdefghij"), 9, 0, "", 0, 0);
+    test(S("abcdefghij"), 9, 0, "abcde", 0, 0);
+    test(S("abcdefghij"), 9, 0, "abcde", 1, -1);
+    test(S("abcdefghij"), 9, 0, "abcde", 2, -2);
+    test(S("abcdefghij"), 9, 0, "abcde", 4, -4);
+    test(S("abcdefghij"), 9, 0, "abcde", 5, -5);
+    test(S("abcdefghij"), 9, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghij"), 9, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghij"), 9, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghij"), 9, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghij"), 9, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghij"), 9, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghij"), 9, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghij"), 9, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghij"), 9, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghij"), 9, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghij"), 9, 1, "", 0, 1);
+    test(S("abcdefghij"), 9, 1, "abcde", 0, 1);
+    test(S("abcdefghij"), 9, 1, "abcde", 1, 9);
+    test(S("abcdefghij"), 9, 1, "abcde", 2, 9);
+    test(S("abcdefghij"), 9, 1, "abcde", 4, 9);
+    test(S("abcdefghij"), 9, 1, "abcde", 5, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghij"), 9, 1, "abcdefghij", 1, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghij", 5, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghij", 9, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghij", 10, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghij"), 9, 1, "abcdefghijklmnopqrst", 1, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghijklmnopqrst", 10, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghijklmnopqrst", 19, 9);
+    test(S("abcdefghij"), 9, 1, "abcdefghijklmnopqrst", 20, 9);
+    test(S("abcdefghij"), 9, 2, "", 0, 1);
+    test(S("abcdefghij"), 9, 2, "abcde", 0, 1);
+    test(S("abcdefghij"), 9, 2, "abcde", 1, 9);
+    test(S("abcdefghij"), 9, 2, "abcde", 2, 9);
+    test(S("abcdefghij"), 9, 2, "abcde", 4, 9);
+    test(S("abcdefghij"), 9, 2, "abcde", 5, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghij", 0, 1);
+    test(S("abcdefghij"), 9, 2, "abcdefghij", 1, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghij", 5, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghij", 9, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghij", 10, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghij"), 9, 2, "abcdefghijklmnopqrst", 1, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghijklmnopqrst", 10, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghijklmnopqrst", 19, 9);
+    test(S("abcdefghij"), 9, 2, "abcdefghijklmnopqrst", 20, 9);
+    test(S("abcdefghij"), 10, 0, "", 0, 0);
+    test(S("abcdefghij"), 10, 0, "abcde", 0, 0);
+    test(S("abcdefghij"), 10, 0, "abcde", 1, -1);
+    test(S("abcdefghij"), 10, 0, "abcde", 2, -2);
+    test(S("abcdefghij"), 10, 0, "abcde", 4, -4);
+    test(S("abcdefghij"), 10, 0, "abcde", 5, -5);
+    test(S("abcdefghij"), 10, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghij"), 10, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghij"), 10, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghij"), 10, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghij"), 10, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghij"), 10, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghij"), 10, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghij"), 10, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghij"), 10, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghij"), 10, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghij"), 10, 1, "", 0, 0);
+    test(S("abcdefghij"), 10, 1, "abcde", 0, 0);
+    test(S("abcdefghij"), 10, 1, "abcde", 1, -1);
+    test(S("abcdefghij"), 10, 1, "abcde", 2, -2);
+    test(S("abcdefghij"), 10, 1, "abcde", 4, -4);
+    test(S("abcdefghij"), 10, 1, "abcde", 5, -5);
+    test(S("abcdefghij"), 10, 1, "abcdefghij", 0, 0);
+    test(S("abcdefghij"), 10, 1, "abcdefghij", 1, -1);
+    test(S("abcdefghij"), 10, 1, "abcdefghij", 5, -5);
+    test(S("abcdefghij"), 10, 1, "abcdefghij", 9, -9);
+    test(S("abcdefghij"), 10, 1, "abcdefghij", 10, -10);
+    test(S("abcdefghij"), 10, 1, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghij"), 10, 1, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghij"), 10, 1, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghij"), 10, 1, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghij"), 10, 1, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghij"), 11, 0, "", 0, 0);
+    test(S("abcdefghij"), 11, 0, "abcde", 0, 0);
+    test(S("abcdefghij"), 11, 0, "abcde", 1, 0);
+    test(S("abcdefghij"), 11, 0, "abcde", 2, 0);
+    test(S("abcdefghij"), 11, 0, "abcde", 4, 0);
+    test(S("abcdefghij"), 11, 0, "abcde", 5, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghij", 1, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghij", 5, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghij", 9, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghij", 10, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghijklmnopqrst", 1, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghijklmnopqrst", 10, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghijklmnopqrst", 19, 0);
+    test(S("abcdefghij"), 11, 0, "abcdefghijklmnopqrst", 20, 0);
+}
+
+template <class S>
+void test8()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 0, "", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcde", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcde", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcde", 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcde", 4, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcde", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcde", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcde", 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcde", 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcde", 4, -3);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcde", 5, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghij", 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghij", 5, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghij", 9, -8);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghij", 10, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghijklmnopqrst", 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghijklmnopqrst", 10, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghijklmnopqrst", 19, -18);
+    test(S("abcdefghijklmnopqrst"), 0, 1, "abcdefghijklmnopqrst", 20, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcde", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcde", 1, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcde", 2, 8);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcde", 4, 6);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcde", 5, 5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghij", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghij", 1, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghij", 5, 5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghij", 9, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghij", 10, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghijklmnopqrst", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghijklmnopqrst", 1, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghijklmnopqrst", 10, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghijklmnopqrst", 19, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, "abcdefghijklmnopqrst", 20, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcde", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcde", 1, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcde", 2, 17);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcde", 4, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcde", 5, 14);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghij", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghij", 1, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghij", 5, 14);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghij", 9, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghij", 10, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghijklmnopqrst", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghijklmnopqrst", 1, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghijklmnopqrst", 10, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghijklmnopqrst", 19, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 19, "abcdefghijklmnopqrst", 20, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcde", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcde", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcde", 2, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcde", 4, 16);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcde", 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghij", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghij", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghij", 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghij", 9, 11);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghij", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghijklmnopqrst", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghijklmnopqrst", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghijklmnopqrst", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, "abcdefghijklmnopqrst", 20, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcde", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcde", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcde", 2, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcde", 4, 16);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcde", 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghij", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghij", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghij", 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghij", 9, 11);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghij", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghijklmnopqrst", 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghijklmnopqrst", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghijklmnopqrst", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, "abcdefghijklmnopqrst", 20, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcde", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcde", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcde", 2, -2);
+}
+
+template <class S>
+void test9()
+{
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcde", 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcde", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghijklmnopqrst"), 1, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcde", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcde", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcde", 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcde", 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcde", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghij", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghij", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghij", 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghij", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcde", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcde", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcde", 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcde", 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcde", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghij", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghij", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghij", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghij", 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghij", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghijklmnopqrst", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "", 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcde", 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcde", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcde", 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcde", 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcde", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghij", 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghij", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghij", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghij", 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghij", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghijklmnopqrst", 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcde", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcde", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcde", 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcde", 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcde", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghij", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghij", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghij", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghij", 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghij", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghijklmnopqrst", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcde", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcde", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcde", 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcde", 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcde", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghij", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghij", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghij", 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghij", 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghij", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghijklmnopqrst", 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghijklmnopqrst", 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghijklmnopqrst", 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghijklmnopqrst", 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, "abcdefghijklmnopqrst", 20, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcde", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcde", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcde", 2, -2);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcde", 4, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcde", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghij", 1, -1);
+}
+
+template <class S>
+void test10()
+{
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghijklmnopqrst"), 10, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcde", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcde", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcde", 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcde", 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcde", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghij", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghij", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghij", 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghij", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghijklmnopqrst", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghijklmnopqrst", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghijklmnopqrst", 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, "abcdefghijklmnopqrst", 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "", 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcde", 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcde", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcde", 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcde", 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcde", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghij", 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghij", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghij", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghij", 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghij", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghijklmnopqrst", 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghijklmnopqrst", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghijklmnopqrst", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghijklmnopqrst", 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, "abcdefghijklmnopqrst", 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcde", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcde", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcde", 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcde", 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcde", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghij", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghij", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghij", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghij", 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghij", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghijklmnopqrst", 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghijklmnopqrst", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghijklmnopqrst", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghijklmnopqrst", 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, "abcdefghijklmnopqrst", 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcde", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcde", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcde", 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcde", 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcde", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghij", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghij", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghij", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghij", 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghij", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghijklmnopqrst", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghijklmnopqrst", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghijklmnopqrst", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghijklmnopqrst", 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, "abcdefghijklmnopqrst", 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcde", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcde", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcde", 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcde", 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcde", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghij", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghij", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghij", 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghij", 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghij", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghijklmnopqrst", 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghijklmnopqrst", 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghijklmnopqrst", 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghijklmnopqrst", 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, "abcdefghijklmnopqrst", 20, 10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcde", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcde", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcde", 2, -2);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcde", 4, -4);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcde", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghijklmnopqrst", 0, 0);
+}
+
+template <class S>
+void test11()
+{
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghijklmnopqrst"), 19, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcde", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcde", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcde", 2, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcde", 4, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcde", 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghij", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghij", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghij", 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghij", 9, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghij", 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghijklmnopqrst", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghijklmnopqrst", 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghijklmnopqrst", 19, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, "abcdefghijklmnopqrst", 20, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcde", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcde", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcde", 2, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcde", 4, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcde", 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghij", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghij", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghij", 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghij", 9, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghij", 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghijklmnopqrst", 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghijklmnopqrst", 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghijklmnopqrst", 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghijklmnopqrst", 19, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, "abcdefghijklmnopqrst", 20, 19);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcde", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcde", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcde", 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcde", 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcde", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghij", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghij", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghij", 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghij", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 0, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcde", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcde", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcde", 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcde", 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcde", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghij", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghij", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghij", 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghij", 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghij", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghijklmnopqrst", 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghijklmnopqrst", 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghijklmnopqrst", 19, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 1, "abcdefghijklmnopqrst", 20, -20);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcde", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcde", 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcde", 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcde", 4, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcde", 5, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghij", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghij", 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghij", 5, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghij", 9, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghij", 10, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 10, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 19, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, "abcdefghijklmnopqrst", 20, 0);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    test4<S>();
+    test5<S>();
+    test6<S>();
+    test7<S>();
+    test8<S>();
+    test9<S>();
+    test10<S>();
+    test11<S>();
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    test4<S>();
+    test5<S>();
+    test6<S>();
+    test7<S>();
+    test8<S>();
+    test9<S>();
+    test10<S>();
+    test11<S>();
+    }
+#endif
+}
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
new file mode 100644
index 00000000000..3deb617e8d8
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
@@ -0,0 +1,372 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// int compare(size_type pos1, size_type n1, const basic_string& str) const;
+
+#include <string>
+#include <stdexcept>
+#include <cassert>
+
+#include "min_allocator.h"
+
+int sign(int x)
+{
+    if (x == 0)
+        return 0;
+    if (x < 0)
+        return -1;
+    return 1;
+}
+
+template <class S>
+void
+test(const S& s, typename S::size_type pos1, typename S::size_type n1,
+     const S& str, int x)
+{
+    try
+    {
+        assert(sign(s.compare(pos1, n1, str)) == sign(x));
+        assert(pos1 <= s.size());
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos1 > s.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), 0, 0, S(""), 0);
+    test(S(""), 0, 0, S("abcde"), -5);
+    test(S(""), 0, 0, S("abcdefghij"), -10);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S(""), 0, 1, S(""), 0);
+    test(S(""), 0, 1, S("abcde"), -5);
+    test(S(""), 0, 1, S("abcdefghij"), -10);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), -20);
+    test(S(""), 1, 0, S(""), 0);
+    test(S(""), 1, 0, S("abcde"), 0);
+    test(S(""), 1, 0, S("abcdefghij"), 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 0);
+    test(S("abcde"), 0, 0, S(""), 0);
+    test(S("abcde"), 0, 0, S("abcde"), -5);
+    test(S("abcde"), 0, 0, S("abcdefghij"), -10);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcde"), 0, 1, S(""), 1);
+    test(S("abcde"), 0, 1, S("abcde"), -4);
+    test(S("abcde"), 0, 1, S("abcdefghij"), -9);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), -19);
+    test(S("abcde"), 0, 2, S(""), 2);
+    test(S("abcde"), 0, 2, S("abcde"), -3);
+    test(S("abcde"), 0, 2, S("abcdefghij"), -8);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), -18);
+    test(S("abcde"), 0, 4, S(""), 4);
+    test(S("abcde"), 0, 4, S("abcde"), -1);
+    test(S("abcde"), 0, 4, S("abcdefghij"), -6);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), -16);
+    test(S("abcde"), 0, 5, S(""), 5);
+    test(S("abcde"), 0, 5, S("abcde"), 0);
+    test(S("abcde"), 0, 5, S("abcdefghij"), -5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), -15);
+    test(S("abcde"), 0, 6, S(""), 5);
+    test(S("abcde"), 0, 6, S("abcde"), 0);
+    test(S("abcde"), 0, 6, S("abcdefghij"), -5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), -15);
+    test(S("abcde"), 1, 0, S(""), 0);
+    test(S("abcde"), 1, 0, S("abcde"), -5);
+    test(S("abcde"), 1, 0, S("abcdefghij"), -10);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcde"), 1, 1, S(""), 1);
+    test(S("abcde"), 1, 1, S("abcde"), 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcde"), 1, 2, S(""), 2);
+    test(S("abcde"), 1, 2, S("abcde"), 1);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 1);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcde"), 1, 3, S(""), 3);
+    test(S("abcde"), 1, 3, S("abcde"), 1);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 1);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcde"), 1, 4, S(""), 4);
+    test(S("abcde"), 1, 4, S("abcde"), 1);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 1);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcde"), 1, 5, S(""), 4);
+    test(S("abcde"), 1, 5, S("abcde"), 1);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 1);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcde"), 2, 0, S(""), 0);
+    test(S("abcde"), 2, 0, S("abcde"), -5);
+    test(S("abcde"), 2, 0, S("abcdefghij"), -10);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcde"), 2, 1, S(""), 1);
+    test(S("abcde"), 2, 1, S("abcde"), 2);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 2);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 2);
+    test(S("abcde"), 2, 2, S(""), 2);
+    test(S("abcde"), 2, 2, S("abcde"), 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 2);
+    test(S("abcde"), 2, 3, S(""), 3);
+    test(S("abcde"), 2, 3, S("abcde"), 2);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 2);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 2);
+    test(S("abcde"), 2, 4, S(""), 3);
+    test(S("abcde"), 2, 4, S("abcde"), 2);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 2);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 2);
+    test(S("abcde"), 4, 0, S(""), 0);
+    test(S("abcde"), 4, 0, S("abcde"), -5);
+    test(S("abcde"), 4, 0, S("abcdefghij"), -10);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcde"), 4, 1, S(""), 1);
+    test(S("abcde"), 4, 1, S("abcde"), 4);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 4);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 4);
+    test(S("abcde"), 4, 2, S(""), 1);
+    test(S("abcde"), 4, 2, S("abcde"), 4);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 4);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 4);
+    test(S("abcde"), 5, 0, S(""), 0);
+    test(S("abcde"), 5, 0, S("abcde"), -5);
+    test(S("abcde"), 5, 0, S("abcdefghij"), -10);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcde"), 5, 1, S(""), 0);
+    test(S("abcde"), 5, 1, S("abcde"), -5);
+    test(S("abcde"), 5, 1, S("abcdefghij"), -10);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), -20);
+}
+
+template <class S>
+void test1()
+{
+    test(S("abcde"), 6, 0, S(""), 0);
+    test(S("abcde"), 6, 0, S("abcde"), 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 0);
+    test(S("abcdefghij"), 0, 0, S(""), 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), -5);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), -10);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghij"), 0, 1, S(""), 1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), -4);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), -9);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), -19);
+    test(S("abcdefghij"), 0, 5, S(""), 5);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 0);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), -15);
+    test(S("abcdefghij"), 0, 9, S(""), 9);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 4);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), -11);
+    test(S("abcdefghij"), 0, 10, S(""), 10);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 5);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 0);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), -10);
+    test(S("abcdefghij"), 0, 11, S(""), 10);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 5);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 0);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), -10);
+    test(S("abcdefghij"), 1, 0, S(""), 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), -5);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), -10);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghij"), 1, 1, S(""), 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghij"), 1, 4, S(""), 4);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghij"), 1, 8, S(""), 8);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghij"), 1, 9, S(""), 9);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghij"), 1, 10, S(""), 9);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghij"), 5, 0, S(""), 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), -5);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), -10);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghij"), 5, 1, S(""), 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 5);
+    test(S("abcdefghij"), 5, 2, S(""), 2);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 5);
+    test(S("abcdefghij"), 5, 4, S(""), 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 5);
+    test(S("abcdefghij"), 5, 5, S(""), 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 5);
+    test(S("abcdefghij"), 5, 6, S(""), 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 5);
+    test(S("abcdefghij"), 9, 0, S(""), 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), -5);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), -10);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghij"), 9, 1, S(""), 1);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 9);
+    test(S("abcdefghij"), 9, 2, S(""), 1);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 9);
+    test(S("abcdefghij"), 10, 0, S(""), 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), -5);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), -10);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghij"), 10, 1, S(""), 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), -5);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), -10);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghij"), 11, 0, S(""), 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 0);
+}
+
+template <class S>
+void test2()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 0, S(""), 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S(""), 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), -19);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S(""), 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S(""), 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 14);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S(""), 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 15);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S(""), 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 15);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S(""), 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S(""), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S(""), 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S(""), 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S(""), 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S(""), 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S(""), 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S(""), 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S(""), 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S(""), 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S(""), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S(""), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S(""), 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S(""), 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S(""), 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 19);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S(""), 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S(""), 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), -20);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S(""), 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    }
+#endif
+}
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
new file mode 100644
index 00000000000..122e6e9c487
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
@@ -0,0 +1,5948 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// int compare(size_type pos1, size_type n1, const basic_string& str,
+//             size_type pos2, size_type n2=npos) const;
+//  the "=npos" was added in C++14
+
+#include <string>
+#include <stdexcept>
+#include <cassert>
+
+#include "min_allocator.h"
+
+int sign(int x)
+{
+    if (x == 0)
+        return 0;
+    if (x < 0)
+        return -1;
+    return 1;
+}
+
+template <class S>
+void
+test(const S& s, typename S::size_type pos1, typename S::size_type n1,
+     const S& str, typename S::size_type pos2, typename S::size_type n2, int x)
+{
+    try
+    {
+        assert(sign(s.compare(pos1, n1, str, pos2, n2)) == sign(x));
+        assert(pos1 <= s.size());
+        assert(pos2 <= str.size());
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos1 > s.size() || pos2 > str.size());
+    }
+}
+
+template <class S>
+void
+test_npos(const S& s, typename S::size_type pos1, typename S::size_type n1,
+     const S& str, typename S::size_type pos2, int x)
+{
+    try
+    {
+        assert(sign(s.compare(pos1, n1, str, pos2)) == sign(x));
+        assert(pos1 <= s.size());
+        assert(pos2 <= str.size());
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos1 > s.size() || pos2 > str.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), 0, 0, S(""), 0, 0, 0);
+    test(S(""), 0, 0, S(""), 0, 1, 0);
+    test(S(""), 0, 0, S(""), 1, 0, 0);
+    test(S(""), 0, 0, S("abcde"), 0, 0, 0);
+    test(S(""), 0, 0, S("abcde"), 0, 1, -1);
+    test(S(""), 0, 0, S("abcde"), 0, 2, -2);
+    test(S(""), 0, 0, S("abcde"), 0, 4, -4);
+    test(S(""), 0, 0, S("abcde"), 0, 5, -5);
+    test(S(""), 0, 0, S("abcde"), 0, 6, -5);
+    test(S(""), 0, 0, S("abcde"), 1, 0, 0);
+    test(S(""), 0, 0, S("abcde"), 1, 1, -1);
+    test(S(""), 0, 0, S("abcde"), 1, 2, -2);
+    test(S(""), 0, 0, S("abcde"), 1, 3, -3);
+    test(S(""), 0, 0, S("abcde"), 1, 4, -4);
+    test(S(""), 0, 0, S("abcde"), 1, 5, -4);
+    test(S(""), 0, 0, S("abcde"), 2, 0, 0);
+    test(S(""), 0, 0, S("abcde"), 2, 1, -1);
+    test(S(""), 0, 0, S("abcde"), 2, 2, -2);
+    test(S(""), 0, 0, S("abcde"), 2, 3, -3);
+    test(S(""), 0, 0, S("abcde"), 2, 4, -3);
+    test(S(""), 0, 0, S("abcde"), 4, 0, 0);
+    test(S(""), 0, 0, S("abcde"), 4, 1, -1);
+    test(S(""), 0, 0, S("abcde"), 4, 2, -1);
+    test(S(""), 0, 0, S("abcde"), 5, 0, 0);
+    test(S(""), 0, 0, S("abcde"), 5, 1, 0);
+    test(S(""), 0, 0, S("abcde"), 6, 0, 0);
+    test(S(""), 0, 0, S("abcdefghij"), 0, 0, 0);
+    test(S(""), 0, 0, S("abcdefghij"), 0, 1, -1);
+    test(S(""), 0, 0, S("abcdefghij"), 0, 5, -5);
+    test(S(""), 0, 0, S("abcdefghij"), 0, 9, -9);
+    test(S(""), 0, 0, S("abcdefghij"), 0, 10, -10);
+    test(S(""), 0, 0, S("abcdefghij"), 0, 11, -10);
+    test(S(""), 0, 0, S("abcdefghij"), 1, 0, 0);
+    test(S(""), 0, 0, S("abcdefghij"), 1, 1, -1);
+    test(S(""), 0, 0, S("abcdefghij"), 1, 4, -4);
+    test(S(""), 0, 0, S("abcdefghij"), 1, 8, -8);
+    test(S(""), 0, 0, S("abcdefghij"), 1, 9, -9);
+    test(S(""), 0, 0, S("abcdefghij"), 1, 10, -9);
+    test(S(""), 0, 0, S("abcdefghij"), 5, 0, 0);
+    test(S(""), 0, 0, S("abcdefghij"), 5, 1, -1);
+    test(S(""), 0, 0, S("abcdefghij"), 5, 2, -2);
+    test(S(""), 0, 0, S("abcdefghij"), 5, 4, -4);
+    test(S(""), 0, 0, S("abcdefghij"), 5, 5, -5);
+    test(S(""), 0, 0, S("abcdefghij"), 5, 6, -5);
+    test(S(""), 0, 0, S("abcdefghij"), 9, 0, 0);
+    test(S(""), 0, 0, S("abcdefghij"), 9, 1, -1);
+    test(S(""), 0, 0, S("abcdefghij"), 9, 2, -1);
+    test(S(""), 0, 0, S("abcdefghij"), 10, 0, 0);
+    test(S(""), 0, 0, S("abcdefghij"), 10, 1, 0);
+    test(S(""), 0, 0, S("abcdefghij"), 11, 0, 0);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S(""), 0, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S(""), 0, 1, S(""), 0, 0, 0);
+    test(S(""), 0, 1, S(""), 0, 1, 0);
+    test(S(""), 0, 1, S(""), 1, 0, 0);
+    test(S(""), 0, 1, S("abcde"), 0, 0, 0);
+    test(S(""), 0, 1, S("abcde"), 0, 1, -1);
+    test(S(""), 0, 1, S("abcde"), 0, 2, -2);
+    test(S(""), 0, 1, S("abcde"), 0, 4, -4);
+    test(S(""), 0, 1, S("abcde"), 0, 5, -5);
+    test(S(""), 0, 1, S("abcde"), 0, 6, -5);
+    test(S(""), 0, 1, S("abcde"), 1, 0, 0);
+    test(S(""), 0, 1, S("abcde"), 1, 1, -1);
+    test(S(""), 0, 1, S("abcde"), 1, 2, -2);
+    test(S(""), 0, 1, S("abcde"), 1, 3, -3);
+    test(S(""), 0, 1, S("abcde"), 1, 4, -4);
+    test(S(""), 0, 1, S("abcde"), 1, 5, -4);
+    test(S(""), 0, 1, S("abcde"), 2, 0, 0);
+    test(S(""), 0, 1, S("abcde"), 2, 1, -1);
+    test(S(""), 0, 1, S("abcde"), 2, 2, -2);
+    test(S(""), 0, 1, S("abcde"), 2, 3, -3);
+    test(S(""), 0, 1, S("abcde"), 2, 4, -3);
+    test(S(""), 0, 1, S("abcde"), 4, 0, 0);
+    test(S(""), 0, 1, S("abcde"), 4, 1, -1);
+    test(S(""), 0, 1, S("abcde"), 4, 2, -1);
+    test(S(""), 0, 1, S("abcde"), 5, 0, 0);
+    test(S(""), 0, 1, S("abcde"), 5, 1, 0);
+    test(S(""), 0, 1, S("abcde"), 6, 0, 0);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), 0, 1, S("abcdefghij"), 0, 0, 0);
+    test(S(""), 0, 1, S("abcdefghij"), 0, 1, -1);
+    test(S(""), 0, 1, S("abcdefghij"), 0, 5, -5);
+    test(S(""), 0, 1, S("abcdefghij"), 0, 9, -9);
+    test(S(""), 0, 1, S("abcdefghij"), 0, 10, -10);
+    test(S(""), 0, 1, S("abcdefghij"), 0, 11, -10);
+    test(S(""), 0, 1, S("abcdefghij"), 1, 0, 0);
+    test(S(""), 0, 1, S("abcdefghij"), 1, 1, -1);
+    test(S(""), 0, 1, S("abcdefghij"), 1, 4, -4);
+    test(S(""), 0, 1, S("abcdefghij"), 1, 8, -8);
+    test(S(""), 0, 1, S("abcdefghij"), 1, 9, -9);
+    test(S(""), 0, 1, S("abcdefghij"), 1, 10, -9);
+    test(S(""), 0, 1, S("abcdefghij"), 5, 0, 0);
+    test(S(""), 0, 1, S("abcdefghij"), 5, 1, -1);
+    test(S(""), 0, 1, S("abcdefghij"), 5, 2, -2);
+    test(S(""), 0, 1, S("abcdefghij"), 5, 4, -4);
+    test(S(""), 0, 1, S("abcdefghij"), 5, 5, -5);
+    test(S(""), 0, 1, S("abcdefghij"), 5, 6, -5);
+    test(S(""), 0, 1, S("abcdefghij"), 9, 0, 0);
+    test(S(""), 0, 1, S("abcdefghij"), 9, 1, -1);
+    test(S(""), 0, 1, S("abcdefghij"), 9, 2, -1);
+    test(S(""), 0, 1, S("abcdefghij"), 10, 0, 0);
+    test(S(""), 0, 1, S("abcdefghij"), 10, 1, 0);
+    test(S(""), 0, 1, S("abcdefghij"), 11, 0, 0);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S(""), 0, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S(""), 1, 0, S(""), 0, 0, 0);
+    test(S(""), 1, 0, S(""), 0, 1, 0);
+    test(S(""), 1, 0, S(""), 1, 0, 0);
+    test(S(""), 1, 0, S("abcde"), 0, 0, 0);
+    test(S(""), 1, 0, S("abcde"), 0, 1, 0);
+    test(S(""), 1, 0, S("abcde"), 0, 2, 0);
+    test(S(""), 1, 0, S("abcde"), 0, 4, 0);
+    test(S(""), 1, 0, S("abcde"), 0, 5, 0);
+    test(S(""), 1, 0, S("abcde"), 0, 6, 0);
+    test(S(""), 1, 0, S("abcde"), 1, 0, 0);
+    test(S(""), 1, 0, S("abcde"), 1, 1, 0);
+    test(S(""), 1, 0, S("abcde"), 1, 2, 0);
+    test(S(""), 1, 0, S("abcde"), 1, 3, 0);
+    test(S(""), 1, 0, S("abcde"), 1, 4, 0);
+    test(S(""), 1, 0, S("abcde"), 1, 5, 0);
+    test(S(""), 1, 0, S("abcde"), 2, 0, 0);
+    test(S(""), 1, 0, S("abcde"), 2, 1, 0);
+    test(S(""), 1, 0, S("abcde"), 2, 2, 0);
+    test(S(""), 1, 0, S("abcde"), 2, 3, 0);
+    test(S(""), 1, 0, S("abcde"), 2, 4, 0);
+    test(S(""), 1, 0, S("abcde"), 4, 0, 0);
+    test(S(""), 1, 0, S("abcde"), 4, 1, 0);
+    test(S(""), 1, 0, S("abcde"), 4, 2, 0);
+    test(S(""), 1, 0, S("abcde"), 5, 0, 0);
+    test(S(""), 1, 0, S("abcde"), 5, 1, 0);
+    test(S(""), 1, 0, S("abcde"), 6, 0, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 0, 0, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 0, 1, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 0, 5, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 0, 9, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 0, 10, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 0, 11, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 1, 0, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 1, 1, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 1, 4, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 1, 8, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 1, 9, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 1, 10, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 5, 0, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 5, 1, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 5, 2, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 5, 4, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 5, 5, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 5, 6, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 9, 0, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 9, 1, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 9, 2, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 10, 0, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 10, 1, 0);
+    test(S(""), 1, 0, S("abcdefghij"), 11, 0, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 0, 1, 0);
+}
+
+template <class S>
+void test2()
+{
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 0, 10, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 0, 19, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 0, 20, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 0, 21, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 1, 1, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 1, 9, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 1, 18, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 1, 19, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 1, 20, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 10, 1, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 10, 5, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 10, 9, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 10, 10, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 10, 11, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 19, 1, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 19, 2, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S(""), 1, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 0, 0, S(""), 0, 0, 0);
+    test(S("abcde"), 0, 0, S(""), 0, 1, 0);
+    test(S("abcde"), 0, 0, S(""), 1, 0, 0);
+    test(S("abcde"), 0, 0, S("abcde"), 0, 0, 0);
+    test(S("abcde"), 0, 0, S("abcde"), 0, 1, -1);
+    test(S("abcde"), 0, 0, S("abcde"), 0, 2, -2);
+    test(S("abcde"), 0, 0, S("abcde"), 0, 4, -4);
+    test(S("abcde"), 0, 0, S("abcde"), 0, 5, -5);
+    test(S("abcde"), 0, 0, S("abcde"), 0, 6, -5);
+    test(S("abcde"), 0, 0, S("abcde"), 1, 0, 0);
+    test(S("abcde"), 0, 0, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 0, 0, S("abcde"), 1, 2, -2);
+    test(S("abcde"), 0, 0, S("abcde"), 1, 3, -3);
+    test(S("abcde"), 0, 0, S("abcde"), 1, 4, -4);
+    test(S("abcde"), 0, 0, S("abcde"), 1, 5, -4);
+    test(S("abcde"), 0, 0, S("abcde"), 2, 0, 0);
+    test(S("abcde"), 0, 0, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 0, 0, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 0, 0, S("abcde"), 2, 3, -3);
+    test(S("abcde"), 0, 0, S("abcde"), 2, 4, -3);
+    test(S("abcde"), 0, 0, S("abcde"), 4, 0, 0);
+    test(S("abcde"), 0, 0, S("abcde"), 4, 1, -1);
+    test(S("abcde"), 0, 0, S("abcde"), 4, 2, -1);
+    test(S("abcde"), 0, 0, S("abcde"), 5, 0, 0);
+    test(S("abcde"), 0, 0, S("abcde"), 5, 1, 0);
+    test(S("abcde"), 0, 0, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcde"), 0, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcde"), 0, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 0, 1, S(""), 0, 0, 1);
+    test(S("abcde"), 0, 1, S(""), 0, 1, 1);
+    test(S("abcde"), 0, 1, S(""), 1, 0, 0);
+    test(S("abcde"), 0, 1, S("abcde"), 0, 0, 1);
+}
+
+template <class S>
+void test3()
+{
+    test(S("abcde"), 0, 1, S("abcde"), 0, 1, 0);
+    test(S("abcde"), 0, 1, S("abcde"), 0, 2, -1);
+    test(S("abcde"), 0, 1, S("abcde"), 0, 4, -3);
+    test(S("abcde"), 0, 1, S("abcde"), 0, 5, -4);
+    test(S("abcde"), 0, 1, S("abcde"), 0, 6, -4);
+    test(S("abcde"), 0, 1, S("abcde"), 1, 0, 1);
+    test(S("abcde"), 0, 1, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 0, 1, S("abcde"), 1, 2, -1);
+    test(S("abcde"), 0, 1, S("abcde"), 1, 3, -1);
+    test(S("abcde"), 0, 1, S("abcde"), 1, 4, -1);
+    test(S("abcde"), 0, 1, S("abcde"), 1, 5, -1);
+    test(S("abcde"), 0, 1, S("abcde"), 2, 0, 1);
+    test(S("abcde"), 0, 1, S("abcde"), 2, 1, -2);
+    test(S("abcde"), 0, 1, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 0, 1, S("abcde"), 2, 3, -2);
+    test(S("abcde"), 0, 1, S("abcde"), 2, 4, -2);
+    test(S("abcde"), 0, 1, S("abcde"), 4, 0, 1);
+    test(S("abcde"), 0, 1, S("abcde"), 4, 1, -4);
+    test(S("abcde"), 0, 1, S("abcde"), 4, 2, -4);
+    test(S("abcde"), 0, 1, S("abcde"), 5, 0, 1);
+    test(S("abcde"), 0, 1, S("abcde"), 5, 1, 1);
+    test(S("abcde"), 0, 1, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 0, 1, 0);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 0, 5, -4);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 0, 9, -8);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 0, 10, -9);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 0, 11, -9);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 1, 4, -1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 1, 8, -1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 1, 9, -1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 1, 10, -1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 5, 1, -5);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 5, 2, -5);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 5, 4, -5);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 9, 1, -9);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 9, 2, -9);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcde"), 0, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 0, 1, 0);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 0, 10, -9);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 0, 19, -18);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 0, 20, -19);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 0, 21, -19);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcde"), 0, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 0, 2, S(""), 0, 0, 2);
+    test(S("abcde"), 0, 2, S(""), 0, 1, 2);
+    test(S("abcde"), 0, 2, S(""), 1, 0, 0);
+    test(S("abcde"), 0, 2, S("abcde"), 0, 0, 2);
+    test(S("abcde"), 0, 2, S("abcde"), 0, 1, 1);
+    test(S("abcde"), 0, 2, S("abcde"), 0, 2, 0);
+    test(S("abcde"), 0, 2, S("abcde"), 0, 4, -2);
+    test(S("abcde"), 0, 2, S("abcde"), 0, 5, -3);
+    test(S("abcde"), 0, 2, S("abcde"), 0, 6, -3);
+    test(S("abcde"), 0, 2, S("abcde"), 1, 0, 2);
+    test(S("abcde"), 0, 2, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 0, 2, S("abcde"), 1, 2, -1);
+    test(S("abcde"), 0, 2, S("abcde"), 1, 3, -1);
+    test(S("abcde"), 0, 2, S("abcde"), 1, 4, -1);
+    test(S("abcde"), 0, 2, S("abcde"), 1, 5, -1);
+    test(S("abcde"), 0, 2, S("abcde"), 2, 0, 2);
+    test(S("abcde"), 0, 2, S("abcde"), 2, 1, -2);
+    test(S("abcde"), 0, 2, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 0, 2, S("abcde"), 2, 3, -2);
+    test(S("abcde"), 0, 2, S("abcde"), 2, 4, -2);
+    test(S("abcde"), 0, 2, S("abcde"), 4, 0, 2);
+    test(S("abcde"), 0, 2, S("abcde"), 4, 1, -4);
+    test(S("abcde"), 0, 2, S("abcde"), 4, 2, -4);
+    test(S("abcde"), 0, 2, S("abcde"), 5, 0, 2);
+    test(S("abcde"), 0, 2, S("abcde"), 5, 1, 2);
+    test(S("abcde"), 0, 2, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 0, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 0, 1, 1);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 0, 5, -3);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 0, 9, -7);
+}
+
+template <class S>
+void test4()
+{
+    test(S("abcde"), 0, 2, S("abcdefghij"), 0, 10, -8);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 0, 11, -8);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 1, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 1, 4, -1);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 1, 8, -1);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 1, 9, -1);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 1, 10, -1);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 5, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 5, 1, -5);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 5, 2, -5);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 5, 4, -5);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 9, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 9, 1, -9);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 9, 2, -9);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 10, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 10, 1, 2);
+    test(S("abcde"), 0, 2, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 0, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 0, 10, -8);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 0, 19, -17);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 0, 20, -18);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 0, 21, -18);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 1, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 10, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 19, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 20, 0, 2);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 20, 1, 2);
+    test(S("abcde"), 0, 2, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 0, 4, S(""), 0, 0, 4);
+    test(S("abcde"), 0, 4, S(""), 0, 1, 4);
+    test(S("abcde"), 0, 4, S(""), 1, 0, 0);
+    test(S("abcde"), 0, 4, S("abcde"), 0, 0, 4);
+    test(S("abcde"), 0, 4, S("abcde"), 0, 1, 3);
+    test(S("abcde"), 0, 4, S("abcde"), 0, 2, 2);
+    test(S("abcde"), 0, 4, S("abcde"), 0, 4, 0);
+    test(S("abcde"), 0, 4, S("abcde"), 0, 5, -1);
+    test(S("abcde"), 0, 4, S("abcde"), 0, 6, -1);
+    test(S("abcde"), 0, 4, S("abcde"), 1, 0, 4);
+    test(S("abcde"), 0, 4, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 0, 4, S("abcde"), 1, 2, -1);
+    test(S("abcde"), 0, 4, S("abcde"), 1, 3, -1);
+    test(S("abcde"), 0, 4, S("abcde"), 1, 4, -1);
+    test(S("abcde"), 0, 4, S("abcde"), 1, 5, -1);
+    test(S("abcde"), 0, 4, S("abcde"), 2, 0, 4);
+    test(S("abcde"), 0, 4, S("abcde"), 2, 1, -2);
+    test(S("abcde"), 0, 4, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 0, 4, S("abcde"), 2, 3, -2);
+    test(S("abcde"), 0, 4, S("abcde"), 2, 4, -2);
+    test(S("abcde"), 0, 4, S("abcde"), 4, 0, 4);
+    test(S("abcde"), 0, 4, S("abcde"), 4, 1, -4);
+    test(S("abcde"), 0, 4, S("abcde"), 4, 2, -4);
+    test(S("abcde"), 0, 4, S("abcde"), 5, 0, 4);
+    test(S("abcde"), 0, 4, S("abcde"), 5, 1, 4);
+    test(S("abcde"), 0, 4, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 0, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 0, 1, 3);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 0, 5, -1);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 0, 9, -5);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 0, 10, -6);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 0, 11, -6);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 1, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 1, 4, -1);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 1, 8, -1);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 1, 9, -1);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 1, 10, -1);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 5, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 5, 1, -5);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 5, 2, -5);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 5, 4, -5);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 9, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 9, 1, -9);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 9, 2, -9);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 10, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 10, 1, 4);
+    test(S("abcde"), 0, 4, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 0, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 0, 1, 3);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 0, 10, -6);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 0, 19, -15);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 0, 20, -16);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 0, 21, -16);
+}
+
+template <class S>
+void test5()
+{
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 1, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 10, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 19, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 20, 0, 4);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 20, 1, 4);
+    test(S("abcde"), 0, 4, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 0, 5, S(""), 0, 0, 5);
+    test(S("abcde"), 0, 5, S(""), 0, 1, 5);
+    test(S("abcde"), 0, 5, S(""), 1, 0, 0);
+    test(S("abcde"), 0, 5, S("abcde"), 0, 0, 5);
+    test(S("abcde"), 0, 5, S("abcde"), 0, 1, 4);
+    test(S("abcde"), 0, 5, S("abcde"), 0, 2, 3);
+    test(S("abcde"), 0, 5, S("abcde"), 0, 4, 1);
+    test(S("abcde"), 0, 5, S("abcde"), 0, 5, 0);
+    test(S("abcde"), 0, 5, S("abcde"), 0, 6, 0);
+    test(S("abcde"), 0, 5, S("abcde"), 1, 0, 5);
+    test(S("abcde"), 0, 5, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 0, 5, S("abcde"), 1, 2, -1);
+    test(S("abcde"), 0, 5, S("abcde"), 1, 3, -1);
+    test(S("abcde"), 0, 5, S("abcde"), 1, 4, -1);
+    test(S("abcde"), 0, 5, S("abcde"), 1, 5, -1);
+    test(S("abcde"), 0, 5, S("abcde"), 2, 0, 5);
+    test(S("abcde"), 0, 5, S("abcde"), 2, 1, -2);
+    test(S("abcde"), 0, 5, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 0, 5, S("abcde"), 2, 3, -2);
+    test(S("abcde"), 0, 5, S("abcde"), 2, 4, -2);
+    test(S("abcde"), 0, 5, S("abcde"), 4, 0, 5);
+    test(S("abcde"), 0, 5, S("abcde"), 4, 1, -4);
+    test(S("abcde"), 0, 5, S("abcde"), 4, 2, -4);
+    test(S("abcde"), 0, 5, S("abcde"), 5, 0, 5);
+    test(S("abcde"), 0, 5, S("abcde"), 5, 1, 5);
+    test(S("abcde"), 0, 5, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 0, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 0, 1, 4);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 0, 5, 0);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 0, 9, -4);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 0, 10, -5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 0, 11, -5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 1, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 1, 4, -1);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 1, 8, -1);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 1, 9, -1);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 1, 10, -1);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 5, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 5, 1, -5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 5, 2, -5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 5, 4, -5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 9, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 9, 1, -9);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 9, 2, -9);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 10, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 10, 1, 5);
+    test(S("abcde"), 0, 5, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 0, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 0, 1, 4);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 0, 10, -5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 0, 19, -14);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 0, 20, -15);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 0, 21, -15);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 1, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 10, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 19, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 20, 0, 5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 20, 1, 5);
+    test(S("abcde"), 0, 5, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 0, 6, S(""), 0, 0, 5);
+    test(S("abcde"), 0, 6, S(""), 0, 1, 5);
+    test(S("abcde"), 0, 6, S(""), 1, 0, 0);
+    test(S("abcde"), 0, 6, S("abcde"), 0, 0, 5);
+    test(S("abcde"), 0, 6, S("abcde"), 0, 1, 4);
+    test(S("abcde"), 0, 6, S("abcde"), 0, 2, 3);
+    test(S("abcde"), 0, 6, S("abcde"), 0, 4, 1);
+    test(S("abcde"), 0, 6, S("abcde"), 0, 5, 0);
+}
+
+template <class S>
+void test6()
+{
+    test(S("abcde"), 0, 6, S("abcde"), 0, 6, 0);
+    test(S("abcde"), 0, 6, S("abcde"), 1, 0, 5);
+    test(S("abcde"), 0, 6, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 0, 6, S("abcde"), 1, 2, -1);
+    test(S("abcde"), 0, 6, S("abcde"), 1, 3, -1);
+    test(S("abcde"), 0, 6, S("abcde"), 1, 4, -1);
+    test(S("abcde"), 0, 6, S("abcde"), 1, 5, -1);
+    test(S("abcde"), 0, 6, S("abcde"), 2, 0, 5);
+    test(S("abcde"), 0, 6, S("abcde"), 2, 1, -2);
+    test(S("abcde"), 0, 6, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 0, 6, S("abcde"), 2, 3, -2);
+    test(S("abcde"), 0, 6, S("abcde"), 2, 4, -2);
+    test(S("abcde"), 0, 6, S("abcde"), 4, 0, 5);
+    test(S("abcde"), 0, 6, S("abcde"), 4, 1, -4);
+    test(S("abcde"), 0, 6, S("abcde"), 4, 2, -4);
+    test(S("abcde"), 0, 6, S("abcde"), 5, 0, 5);
+    test(S("abcde"), 0, 6, S("abcde"), 5, 1, 5);
+    test(S("abcde"), 0, 6, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 0, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 0, 1, 4);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 0, 5, 0);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 0, 9, -4);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 0, 10, -5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 0, 11, -5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 1, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 1, 4, -1);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 1, 8, -1);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 1, 9, -1);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 1, 10, -1);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 5, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 5, 1, -5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 5, 2, -5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 5, 4, -5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 9, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 9, 1, -9);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 9, 2, -9);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 10, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 10, 1, 5);
+    test(S("abcde"), 0, 6, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 0, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 0, 1, 4);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 0, 10, -5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 0, 19, -14);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 0, 20, -15);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 0, 21, -15);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 1, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 10, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 19, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 20, 0, 5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 20, 1, 5);
+    test(S("abcde"), 0, 6, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 1, 0, S(""), 0, 0, 0);
+    test(S("abcde"), 1, 0, S(""), 0, 1, 0);
+    test(S("abcde"), 1, 0, S(""), 1, 0, 0);
+    test(S("abcde"), 1, 0, S("abcde"), 0, 0, 0);
+    test(S("abcde"), 1, 0, S("abcde"), 0, 1, -1);
+    test(S("abcde"), 1, 0, S("abcde"), 0, 2, -2);
+    test(S("abcde"), 1, 0, S("abcde"), 0, 4, -4);
+    test(S("abcde"), 1, 0, S("abcde"), 0, 5, -5);
+    test(S("abcde"), 1, 0, S("abcde"), 0, 6, -5);
+    test(S("abcde"), 1, 0, S("abcde"), 1, 0, 0);
+    test(S("abcde"), 1, 0, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 1, 0, S("abcde"), 1, 2, -2);
+    test(S("abcde"), 1, 0, S("abcde"), 1, 3, -3);
+    test(S("abcde"), 1, 0, S("abcde"), 1, 4, -4);
+    test(S("abcde"), 1, 0, S("abcde"), 1, 5, -4);
+    test(S("abcde"), 1, 0, S("abcde"), 2, 0, 0);
+    test(S("abcde"), 1, 0, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 1, 0, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 1, 0, S("abcde"), 2, 3, -3);
+    test(S("abcde"), 1, 0, S("abcde"), 2, 4, -3);
+    test(S("abcde"), 1, 0, S("abcde"), 4, 0, 0);
+    test(S("abcde"), 1, 0, S("abcde"), 4, 1, -1);
+    test(S("abcde"), 1, 0, S("abcde"), 4, 2, -1);
+    test(S("abcde"), 1, 0, S("abcde"), 5, 0, 0);
+    test(S("abcde"), 1, 0, S("abcde"), 5, 1, 0);
+    test(S("abcde"), 1, 0, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 1, 1, -1);
+}
+
+template <class S>
+void test7()
+{
+    test(S("abcde"), 1, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcde"), 1, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcde"), 1, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 1, 1, S(""), 0, 0, 1);
+    test(S("abcde"), 1, 1, S(""), 0, 1, 1);
+    test(S("abcde"), 1, 1, S(""), 1, 0, 0);
+    test(S("abcde"), 1, 1, S("abcde"), 0, 0, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 0, 1, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 0, 2, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 0, 4, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 0, 5, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 0, 6, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 1, 0, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 1, 1, 0);
+    test(S("abcde"), 1, 1, S("abcde"), 1, 2, -1);
+    test(S("abcde"), 1, 1, S("abcde"), 1, 3, -2);
+    test(S("abcde"), 1, 1, S("abcde"), 1, 4, -3);
+    test(S("abcde"), 1, 1, S("abcde"), 1, 5, -3);
+    test(S("abcde"), 1, 1, S("abcde"), 2, 0, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 1, 1, S("abcde"), 2, 2, -1);
+    test(S("abcde"), 1, 1, S("abcde"), 2, 3, -1);
+    test(S("abcde"), 1, 1, S("abcde"), 2, 4, -1);
+    test(S("abcde"), 1, 1, S("abcde"), 4, 0, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 4, 1, -3);
+    test(S("abcde"), 1, 1, S("abcde"), 4, 2, -3);
+    test(S("abcde"), 1, 1, S("abcde"), 5, 0, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 5, 1, 1);
+    test(S("abcde"), 1, 1, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 0, 1, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 0, 5, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 0, 9, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 0, 10, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 0, 11, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 1, 1, 0);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 1, 4, -3);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 1, 8, -7);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 1, 9, -8);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 1, 10, -8);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 5, 1, -4);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 5, 2, -4);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 5, 5, -4);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 5, 6, -4);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 9, 1, -8);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 9, 2, -8);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcde"), 1, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 1, 1, 0);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 1, 9, -8);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 1, 18, -17);
+}
+
+template <class S>
+void test8()
+{
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 1, 19, -18);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 1, 20, -18);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcde"), 1, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 1, 2, S(""), 0, 0, 2);
+    test(S("abcde"), 1, 2, S(""), 0, 1, 2);
+    test(S("abcde"), 1, 2, S(""), 1, 0, 0);
+    test(S("abcde"), 1, 2, S("abcde"), 0, 0, 2);
+    test(S("abcde"), 1, 2, S("abcde"), 0, 1, 1);
+    test(S("abcde"), 1, 2, S("abcde"), 0, 2, 1);
+    test(S("abcde"), 1, 2, S("abcde"), 0, 4, 1);
+    test(S("abcde"), 1, 2, S("abcde"), 0, 5, 1);
+    test(S("abcde"), 1, 2, S("abcde"), 0, 6, 1);
+    test(S("abcde"), 1, 2, S("abcde"), 1, 0, 2);
+    test(S("abcde"), 1, 2, S("abcde"), 1, 1, 1);
+    test(S("abcde"), 1, 2, S("abcde"), 1, 2, 0);
+    test(S("abcde"), 1, 2, S("abcde"), 1, 3, -1);
+    test(S("abcde"), 1, 2, S("abcde"), 1, 4, -2);
+    test(S("abcde"), 1, 2, S("abcde"), 1, 5, -2);
+    test(S("abcde"), 1, 2, S("abcde"), 2, 0, 2);
+    test(S("abcde"), 1, 2, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 1, 2, S("abcde"), 2, 2, -1);
+    test(S("abcde"), 1, 2, S("abcde"), 2, 3, -1);
+    test(S("abcde"), 1, 2, S("abcde"), 2, 4, -1);
+    test(S("abcde"), 1, 2, S("abcde"), 4, 0, 2);
+    test(S("abcde"), 1, 2, S("abcde"), 4, 1, -3);
+    test(S("abcde"), 1, 2, S("abcde"), 4, 2, -3);
+    test(S("abcde"), 1, 2, S("abcde"), 5, 0, 2);
+    test(S("abcde"), 1, 2, S("abcde"), 5, 1, 2);
+    test(S("abcde"), 1, 2, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 0, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 0, 1, 1);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 0, 5, 1);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 0, 9, 1);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 0, 10, 1);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 0, 11, 1);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 1, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 1, 1, 1);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 1, 4, -2);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 1, 8, -6);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 1, 9, -7);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 1, 10, -7);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 5, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 5, 1, -4);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 5, 2, -4);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 5, 5, -4);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 5, 6, -4);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 9, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 9, 1, -8);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 9, 2, -8);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 10, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 10, 1, 2);
+    test(S("abcde"), 1, 2, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 0, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 1, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 1, 1, 1);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 1, 9, -7);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 1, 18, -16);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 1, 19, -17);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 1, 20, -17);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 10, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 19, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 20, 0, 2);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 20, 1, 2);
+    test(S("abcde"), 1, 2, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 1, 3, S(""), 0, 0, 3);
+    test(S("abcde"), 1, 3, S(""), 0, 1, 3);
+    test(S("abcde"), 1, 3, S(""), 1, 0, 0);
+    test(S("abcde"), 1, 3, S("abcde"), 0, 0, 3);
+    test(S("abcde"), 1, 3, S("abcde"), 0, 1, 1);
+    test(S("abcde"), 1, 3, S("abcde"), 0, 2, 1);
+    test(S("abcde"), 1, 3, S("abcde"), 0, 4, 1);
+    test(S("abcde"), 1, 3, S("abcde"), 0, 5, 1);
+    test(S("abcde"), 1, 3, S("abcde"), 0, 6, 1);
+    test(S("abcde"), 1, 3, S("abcde"), 1, 0, 3);
+    test(S("abcde"), 1, 3, S("abcde"), 1, 1, 2);
+    test(S("abcde"), 1, 3, S("abcde"), 1, 2, 1);
+}
+
+template <class S>
+void test9()
+{
+    test(S("abcde"), 1, 3, S("abcde"), 1, 3, 0);
+    test(S("abcde"), 1, 3, S("abcde"), 1, 4, -1);
+    test(S("abcde"), 1, 3, S("abcde"), 1, 5, -1);
+    test(S("abcde"), 1, 3, S("abcde"), 2, 0, 3);
+    test(S("abcde"), 1, 3, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 1, 3, S("abcde"), 2, 2, -1);
+    test(S("abcde"), 1, 3, S("abcde"), 2, 3, -1);
+    test(S("abcde"), 1, 3, S("abcde"), 2, 4, -1);
+    test(S("abcde"), 1, 3, S("abcde"), 4, 0, 3);
+    test(S("abcde"), 1, 3, S("abcde"), 4, 1, -3);
+    test(S("abcde"), 1, 3, S("abcde"), 4, 2, -3);
+    test(S("abcde"), 1, 3, S("abcde"), 5, 0, 3);
+    test(S("abcde"), 1, 3, S("abcde"), 5, 1, 3);
+    test(S("abcde"), 1, 3, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 0, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 0, 1, 1);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 0, 5, 1);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 0, 9, 1);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 0, 10, 1);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 0, 11, 1);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 1, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 1, 1, 2);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 1, 4, -1);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 1, 8, -5);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 1, 9, -6);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 1, 10, -6);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 5, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 5, 1, -4);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 5, 2, -4);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 5, 5, -4);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 5, 6, -4);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 9, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 9, 1, -8);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 9, 2, -8);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 10, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 10, 1, 3);
+    test(S("abcde"), 1, 3, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 0, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 1, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 1, 1, 2);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 1, 9, -6);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 1, 18, -15);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 1, 19, -16);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 1, 20, -16);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 10, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 19, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 20, 0, 3);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 20, 1, 3);
+    test(S("abcde"), 1, 3, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 1, 4, S(""), 0, 0, 4);
+    test(S("abcde"), 1, 4, S(""), 0, 1, 4);
+    test(S("abcde"), 1, 4, S(""), 1, 0, 0);
+    test(S("abcde"), 1, 4, S("abcde"), 0, 0, 4);
+    test(S("abcde"), 1, 4, S("abcde"), 0, 1, 1);
+    test(S("abcde"), 1, 4, S("abcde"), 0, 2, 1);
+    test(S("abcde"), 1, 4, S("abcde"), 0, 4, 1);
+    test(S("abcde"), 1, 4, S("abcde"), 0, 5, 1);
+    test(S("abcde"), 1, 4, S("abcde"), 0, 6, 1);
+    test(S("abcde"), 1, 4, S("abcde"), 1, 0, 4);
+    test(S("abcde"), 1, 4, S("abcde"), 1, 1, 3);
+    test(S("abcde"), 1, 4, S("abcde"), 1, 2, 2);
+    test(S("abcde"), 1, 4, S("abcde"), 1, 3, 1);
+    test(S("abcde"), 1, 4, S("abcde"), 1, 4, 0);
+    test(S("abcde"), 1, 4, S("abcde"), 1, 5, 0);
+    test(S("abcde"), 1, 4, S("abcde"), 2, 0, 4);
+    test(S("abcde"), 1, 4, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 1, 4, S("abcde"), 2, 2, -1);
+    test(S("abcde"), 1, 4, S("abcde"), 2, 3, -1);
+    test(S("abcde"), 1, 4, S("abcde"), 2, 4, -1);
+    test(S("abcde"), 1, 4, S("abcde"), 4, 0, 4);
+    test(S("abcde"), 1, 4, S("abcde"), 4, 1, -3);
+    test(S("abcde"), 1, 4, S("abcde"), 4, 2, -3);
+    test(S("abcde"), 1, 4, S("abcde"), 5, 0, 4);
+    test(S("abcde"), 1, 4, S("abcde"), 5, 1, 4);
+    test(S("abcde"), 1, 4, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 0, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 0, 1, 1);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 0, 5, 1);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 0, 9, 1);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 0, 10, 1);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 0, 11, 1);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 1, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 1, 1, 3);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 1, 4, 0);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 1, 8, -4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 1, 9, -5);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 1, 10, -5);
+}
+
+template <class S>
+void test10()
+{
+    test(S("abcde"), 1, 4, S("abcdefghij"), 5, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 5, 1, -4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 5, 2, -4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 5, 5, -4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 5, 6, -4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 9, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 9, 1, -8);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 9, 2, -8);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 10, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 10, 1, 4);
+    test(S("abcde"), 1, 4, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 0, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 1, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 1, 1, 3);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 1, 9, -5);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 1, 18, -14);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 1, 19, -15);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 1, 20, -15);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 10, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 19, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 20, 0, 4);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 20, 1, 4);
+    test(S("abcde"), 1, 4, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 1, 5, S(""), 0, 0, 4);
+    test(S("abcde"), 1, 5, S(""), 0, 1, 4);
+    test(S("abcde"), 1, 5, S(""), 1, 0, 0);
+    test(S("abcde"), 1, 5, S("abcde"), 0, 0, 4);
+    test(S("abcde"), 1, 5, S("abcde"), 0, 1, 1);
+    test(S("abcde"), 1, 5, S("abcde"), 0, 2, 1);
+    test(S("abcde"), 1, 5, S("abcde"), 0, 4, 1);
+    test(S("abcde"), 1, 5, S("abcde"), 0, 5, 1);
+    test(S("abcde"), 1, 5, S("abcde"), 0, 6, 1);
+    test(S("abcde"), 1, 5, S("abcde"), 1, 0, 4);
+    test(S("abcde"), 1, 5, S("abcde"), 1, 1, 3);
+    test(S("abcde"), 1, 5, S("abcde"), 1, 2, 2);
+    test(S("abcde"), 1, 5, S("abcde"), 1, 3, 1);
+    test(S("abcde"), 1, 5, S("abcde"), 1, 4, 0);
+    test(S("abcde"), 1, 5, S("abcde"), 1, 5, 0);
+    test(S("abcde"), 1, 5, S("abcde"), 2, 0, 4);
+    test(S("abcde"), 1, 5, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 1, 5, S("abcde"), 2, 2, -1);
+    test(S("abcde"), 1, 5, S("abcde"), 2, 3, -1);
+    test(S("abcde"), 1, 5, S("abcde"), 2, 4, -1);
+    test(S("abcde"), 1, 5, S("abcde"), 4, 0, 4);
+    test(S("abcde"), 1, 5, S("abcde"), 4, 1, -3);
+    test(S("abcde"), 1, 5, S("abcde"), 4, 2, -3);
+    test(S("abcde"), 1, 5, S("abcde"), 5, 0, 4);
+    test(S("abcde"), 1, 5, S("abcde"), 5, 1, 4);
+    test(S("abcde"), 1, 5, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 0, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 0, 1, 1);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 0, 5, 1);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 0, 9, 1);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 0, 10, 1);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 0, 11, 1);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 1, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 1, 1, 3);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 1, 4, 0);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 1, 8, -4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 1, 9, -5);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 1, 10, -5);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 5, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 5, 1, -4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 5, 2, -4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 5, 5, -4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 5, 6, -4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 9, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 9, 1, -8);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 9, 2, -8);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 10, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 10, 1, 4);
+    test(S("abcde"), 1, 5, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 0, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 1, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 1, 1, 3);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 1, 9, -5);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 1, 18, -14);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 1, 19, -15);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 1, 20, -15);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 10, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 10, 1, -9);
+}
+
+template <class S>
+void test11()
+{
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 19, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 20, 0, 4);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 20, 1, 4);
+    test(S("abcde"), 1, 5, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 2, 0, S(""), 0, 0, 0);
+    test(S("abcde"), 2, 0, S(""), 0, 1, 0);
+    test(S("abcde"), 2, 0, S(""), 1, 0, 0);
+    test(S("abcde"), 2, 0, S("abcde"), 0, 0, 0);
+    test(S("abcde"), 2, 0, S("abcde"), 0, 1, -1);
+    test(S("abcde"), 2, 0, S("abcde"), 0, 2, -2);
+    test(S("abcde"), 2, 0, S("abcde"), 0, 4, -4);
+    test(S("abcde"), 2, 0, S("abcde"), 0, 5, -5);
+    test(S("abcde"), 2, 0, S("abcde"), 0, 6, -5);
+    test(S("abcde"), 2, 0, S("abcde"), 1, 0, 0);
+    test(S("abcde"), 2, 0, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 2, 0, S("abcde"), 1, 2, -2);
+    test(S("abcde"), 2, 0, S("abcde"), 1, 3, -3);
+    test(S("abcde"), 2, 0, S("abcde"), 1, 4, -4);
+    test(S("abcde"), 2, 0, S("abcde"), 1, 5, -4);
+    test(S("abcde"), 2, 0, S("abcde"), 2, 0, 0);
+    test(S("abcde"), 2, 0, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 2, 0, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 2, 0, S("abcde"), 2, 3, -3);
+    test(S("abcde"), 2, 0, S("abcde"), 2, 4, -3);
+    test(S("abcde"), 2, 0, S("abcde"), 4, 0, 0);
+    test(S("abcde"), 2, 0, S("abcde"), 4, 1, -1);
+    test(S("abcde"), 2, 0, S("abcde"), 4, 2, -1);
+    test(S("abcde"), 2, 0, S("abcde"), 5, 0, 0);
+    test(S("abcde"), 2, 0, S("abcde"), 5, 1, 0);
+    test(S("abcde"), 2, 0, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcde"), 2, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcde"), 2, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 2, 1, S(""), 0, 0, 1);
+    test(S("abcde"), 2, 1, S(""), 0, 1, 1);
+    test(S("abcde"), 2, 1, S(""), 1, 0, 0);
+    test(S("abcde"), 2, 1, S("abcde"), 0, 0, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 0, 1, 2);
+    test(S("abcde"), 2, 1, S("abcde"), 0, 2, 2);
+    test(S("abcde"), 2, 1, S("abcde"), 0, 4, 2);
+    test(S("abcde"), 2, 1, S("abcde"), 0, 5, 2);
+    test(S("abcde"), 2, 1, S("abcde"), 0, 6, 2);
+    test(S("abcde"), 2, 1, S("abcde"), 1, 0, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 1, 1, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 1, 2, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 1, 3, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 1, 4, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 1, 5, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 2, 0, 1);
+}
+
+template <class S>
+void test12()
+{
+    test(S("abcde"), 2, 1, S("abcde"), 2, 1, 0);
+    test(S("abcde"), 2, 1, S("abcde"), 2, 2, -1);
+    test(S("abcde"), 2, 1, S("abcde"), 2, 3, -2);
+    test(S("abcde"), 2, 1, S("abcde"), 2, 4, -2);
+    test(S("abcde"), 2, 1, S("abcde"), 4, 0, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 4, 1, -2);
+    test(S("abcde"), 2, 1, S("abcde"), 4, 2, -2);
+    test(S("abcde"), 2, 1, S("abcde"), 5, 0, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 5, 1, 1);
+    test(S("abcde"), 2, 1, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 0, 1, 2);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 0, 5, 2);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 0, 9, 2);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 0, 10, 2);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 0, 11, 2);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 1, 1, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 1, 4, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 1, 8, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 1, 9, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 1, 10, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 5, 1, -3);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 5, 2, -3);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 5, 4, -3);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 5, 5, -3);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 5, 6, -3);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 9, 1, -7);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 9, 2, -7);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcde"), 2, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 0, 1, 2);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 0, 10, 2);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 0, 19, 2);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 0, 20, 2);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 0, 21, 2);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 1, 1, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 1, 9, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 1, 18, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 1, 19, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 1, 20, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 10, 1, -8);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 10, 5, -8);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 10, 9, -8);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 10, 10, -8);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 10, 11, -8);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 19, 1, -17);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 19, 2, -17);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcde"), 2, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 2, 2, S(""), 0, 0, 2);
+    test(S("abcde"), 2, 2, S(""), 0, 1, 2);
+    test(S("abcde"), 2, 2, S(""), 1, 0, 0);
+    test(S("abcde"), 2, 2, S("abcde"), 0, 0, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 0, 1, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 0, 2, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 0, 4, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 0, 5, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 0, 6, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 1, 0, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 1, 1, 1);
+    test(S("abcde"), 2, 2, S("abcde"), 1, 2, 1);
+    test(S("abcde"), 2, 2, S("abcde"), 1, 3, 1);
+    test(S("abcde"), 2, 2, S("abcde"), 1, 4, 1);
+    test(S("abcde"), 2, 2, S("abcde"), 1, 5, 1);
+    test(S("abcde"), 2, 2, S("abcde"), 2, 0, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 2, 1, 1);
+    test(S("abcde"), 2, 2, S("abcde"), 2, 2, 0);
+    test(S("abcde"), 2, 2, S("abcde"), 2, 3, -1);
+    test(S("abcde"), 2, 2, S("abcde"), 2, 4, -1);
+    test(S("abcde"), 2, 2, S("abcde"), 4, 0, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 4, 1, -2);
+    test(S("abcde"), 2, 2, S("abcde"), 4, 2, -2);
+    test(S("abcde"), 2, 2, S("abcde"), 5, 0, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 5, 1, 2);
+    test(S("abcde"), 2, 2, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 0, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 0, 1, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 0, 5, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 0, 9, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 0, 10, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 0, 11, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 1, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 1, 1, 1);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 1, 4, 1);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 1, 8, 1);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 1, 9, 1);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 1, 10, 1);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 5, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 5, 1, -3);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 5, 2, -3);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 5, 4, -3);
+}
+
+template <class S>
+void test13()
+{
+    test(S("abcde"), 2, 2, S("abcdefghij"), 5, 5, -3);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 5, 6, -3);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 9, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 9, 1, -7);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 9, 2, -7);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 10, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 10, 1, 2);
+    test(S("abcde"), 2, 2, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 0, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 0, 1, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 0, 10, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 0, 19, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 0, 20, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 0, 21, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 1, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 1, 1, 1);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 1, 9, 1);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 1, 18, 1);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 1, 19, 1);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 1, 20, 1);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 10, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 10, 1, -8);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 10, 5, -8);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 10, 9, -8);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 10, 10, -8);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 10, 11, -8);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 19, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 19, 1, -17);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 19, 2, -17);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 20, 0, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 20, 1, 2);
+    test(S("abcde"), 2, 2, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 2, 3, S(""), 0, 0, 3);
+    test(S("abcde"), 2, 3, S(""), 0, 1, 3);
+    test(S("abcde"), 2, 3, S(""), 1, 0, 0);
+    test(S("abcde"), 2, 3, S("abcde"), 0, 0, 3);
+    test(S("abcde"), 2, 3, S("abcde"), 0, 1, 2);
+    test(S("abcde"), 2, 3, S("abcde"), 0, 2, 2);
+    test(S("abcde"), 2, 3, S("abcde"), 0, 4, 2);
+    test(S("abcde"), 2, 3, S("abcde"), 0, 5, 2);
+    test(S("abcde"), 2, 3, S("abcde"), 0, 6, 2);
+    test(S("abcde"), 2, 3, S("abcde"), 1, 0, 3);
+    test(S("abcde"), 2, 3, S("abcde"), 1, 1, 1);
+    test(S("abcde"), 2, 3, S("abcde"), 1, 2, 1);
+    test(S("abcde"), 2, 3, S("abcde"), 1, 3, 1);
+    test(S("abcde"), 2, 3, S("abcde"), 1, 4, 1);
+    test(S("abcde"), 2, 3, S("abcde"), 1, 5, 1);
+    test(S("abcde"), 2, 3, S("abcde"), 2, 0, 3);
+    test(S("abcde"), 2, 3, S("abcde"), 2, 1, 2);
+    test(S("abcde"), 2, 3, S("abcde"), 2, 2, 1);
+    test(S("abcde"), 2, 3, S("abcde"), 2, 3, 0);
+    test(S("abcde"), 2, 3, S("abcde"), 2, 4, 0);
+    test(S("abcde"), 2, 3, S("abcde"), 4, 0, 3);
+    test(S("abcde"), 2, 3, S("abcde"), 4, 1, -2);
+    test(S("abcde"), 2, 3, S("abcde"), 4, 2, -2);
+    test(S("abcde"), 2, 3, S("abcde"), 5, 0, 3);
+    test(S("abcde"), 2, 3, S("abcde"), 5, 1, 3);
+    test(S("abcde"), 2, 3, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 0, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 0, 1, 2);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 0, 5, 2);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 0, 9, 2);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 0, 10, 2);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 0, 11, 2);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 1, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 1, 1, 1);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 1, 4, 1);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 1, 8, 1);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 1, 9, 1);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 1, 10, 1);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 5, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 5, 1, -3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 5, 2, -3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 5, 4, -3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 5, 5, -3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 5, 6, -3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 9, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 9, 1, -7);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 9, 2, -7);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 10, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 10, 1, 3);
+    test(S("abcde"), 2, 3, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 0, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 0, 1, 2);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 0, 10, 2);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 0, 19, 2);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 0, 20, 2);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 0, 21, 2);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 1, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 1, 1, 1);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 1, 9, 1);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 1, 18, 1);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 1, 19, 1);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 1, 20, 1);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 10, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 10, 1, -8);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 10, 5, -8);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 10, 9, -8);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 10, 10, -8);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 10, 11, -8);
+}
+
+template <class S>
+void test14()
+{
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 19, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 19, 1, -17);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 19, 2, -17);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 20, 0, 3);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 20, 1, 3);
+    test(S("abcde"), 2, 3, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 2, 4, S(""), 0, 0, 3);
+    test(S("abcde"), 2, 4, S(""), 0, 1, 3);
+    test(S("abcde"), 2, 4, S(""), 1, 0, 0);
+    test(S("abcde"), 2, 4, S("abcde"), 0, 0, 3);
+    test(S("abcde"), 2, 4, S("abcde"), 0, 1, 2);
+    test(S("abcde"), 2, 4, S("abcde"), 0, 2, 2);
+    test(S("abcde"), 2, 4, S("abcde"), 0, 4, 2);
+    test(S("abcde"), 2, 4, S("abcde"), 0, 5, 2);
+    test(S("abcde"), 2, 4, S("abcde"), 0, 6, 2);
+    test(S("abcde"), 2, 4, S("abcde"), 1, 0, 3);
+    test(S("abcde"), 2, 4, S("abcde"), 1, 1, 1);
+    test(S("abcde"), 2, 4, S("abcde"), 1, 2, 1);
+    test(S("abcde"), 2, 4, S("abcde"), 1, 3, 1);
+    test(S("abcde"), 2, 4, S("abcde"), 1, 4, 1);
+    test(S("abcde"), 2, 4, S("abcde"), 1, 5, 1);
+    test(S("abcde"), 2, 4, S("abcde"), 2, 0, 3);
+    test(S("abcde"), 2, 4, S("abcde"), 2, 1, 2);
+    test(S("abcde"), 2, 4, S("abcde"), 2, 2, 1);
+    test(S("abcde"), 2, 4, S("abcde"), 2, 3, 0);
+    test(S("abcde"), 2, 4, S("abcde"), 2, 4, 0);
+    test(S("abcde"), 2, 4, S("abcde"), 4, 0, 3);
+    test(S("abcde"), 2, 4, S("abcde"), 4, 1, -2);
+    test(S("abcde"), 2, 4, S("abcde"), 4, 2, -2);
+    test(S("abcde"), 2, 4, S("abcde"), 5, 0, 3);
+    test(S("abcde"), 2, 4, S("abcde"), 5, 1, 3);
+    test(S("abcde"), 2, 4, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 0, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 0, 1, 2);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 0, 5, 2);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 0, 9, 2);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 0, 10, 2);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 0, 11, 2);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 1, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 1, 1, 1);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 1, 4, 1);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 1, 8, 1);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 1, 9, 1);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 1, 10, 1);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 5, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 5, 1, -3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 5, 2, -3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 5, 4, -3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 5, 5, -3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 5, 6, -3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 9, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 9, 1, -7);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 9, 2, -7);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 10, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 10, 1, 3);
+    test(S("abcde"), 2, 4, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 0, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 0, 1, 2);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 0, 10, 2);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 0, 19, 2);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 0, 20, 2);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 0, 21, 2);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 1, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 1, 1, 1);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 1, 9, 1);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 1, 18, 1);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 1, 19, 1);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 1, 20, 1);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 10, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 10, 1, -8);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 10, 5, -8);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 10, 9, -8);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 10, 10, -8);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 10, 11, -8);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 19, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 19, 1, -17);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 19, 2, -17);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 20, 0, 3);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 20, 1, 3);
+    test(S("abcde"), 2, 4, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 4, 0, S(""), 0, 0, 0);
+    test(S("abcde"), 4, 0, S(""), 0, 1, 0);
+    test(S("abcde"), 4, 0, S(""), 1, 0, 0);
+    test(S("abcde"), 4, 0, S("abcde"), 0, 0, 0);
+    test(S("abcde"), 4, 0, S("abcde"), 0, 1, -1);
+    test(S("abcde"), 4, 0, S("abcde"), 0, 2, -2);
+    test(S("abcde"), 4, 0, S("abcde"), 0, 4, -4);
+    test(S("abcde"), 4, 0, S("abcde"), 0, 5, -5);
+    test(S("abcde"), 4, 0, S("abcde"), 0, 6, -5);
+    test(S("abcde"), 4, 0, S("abcde"), 1, 0, 0);
+    test(S("abcde"), 4, 0, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 4, 0, S("abcde"), 1, 2, -2);
+    test(S("abcde"), 4, 0, S("abcde"), 1, 3, -3);
+    test(S("abcde"), 4, 0, S("abcde"), 1, 4, -4);
+    test(S("abcde"), 4, 0, S("abcde"), 1, 5, -4);
+    test(S("abcde"), 4, 0, S("abcde"), 2, 0, 0);
+    test(S("abcde"), 4, 0, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 4, 0, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 4, 0, S("abcde"), 2, 3, -3);
+    test(S("abcde"), 4, 0, S("abcde"), 2, 4, -3);
+}
+
+template <class S>
+void test15()
+{
+    test(S("abcde"), 4, 0, S("abcde"), 4, 0, 0);
+    test(S("abcde"), 4, 0, S("abcde"), 4, 1, -1);
+    test(S("abcde"), 4, 0, S("abcde"), 4, 2, -1);
+    test(S("abcde"), 4, 0, S("abcde"), 5, 0, 0);
+    test(S("abcde"), 4, 0, S("abcde"), 5, 1, 0);
+    test(S("abcde"), 4, 0, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcde"), 4, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcde"), 4, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 4, 1, S(""), 0, 0, 1);
+    test(S("abcde"), 4, 1, S(""), 0, 1, 1);
+    test(S("abcde"), 4, 1, S(""), 1, 0, 0);
+    test(S("abcde"), 4, 1, S("abcde"), 0, 0, 1);
+    test(S("abcde"), 4, 1, S("abcde"), 0, 1, 4);
+    test(S("abcde"), 4, 1, S("abcde"), 0, 2, 4);
+    test(S("abcde"), 4, 1, S("abcde"), 0, 4, 4);
+    test(S("abcde"), 4, 1, S("abcde"), 0, 5, 4);
+    test(S("abcde"), 4, 1, S("abcde"), 0, 6, 4);
+    test(S("abcde"), 4, 1, S("abcde"), 1, 0, 1);
+    test(S("abcde"), 4, 1, S("abcde"), 1, 1, 3);
+    test(S("abcde"), 4, 1, S("abcde"), 1, 2, 3);
+    test(S("abcde"), 4, 1, S("abcde"), 1, 3, 3);
+    test(S("abcde"), 4, 1, S("abcde"), 1, 4, 3);
+    test(S("abcde"), 4, 1, S("abcde"), 1, 5, 3);
+    test(S("abcde"), 4, 1, S("abcde"), 2, 0, 1);
+    test(S("abcde"), 4, 1, S("abcde"), 2, 1, 2);
+    test(S("abcde"), 4, 1, S("abcde"), 2, 2, 2);
+    test(S("abcde"), 4, 1, S("abcde"), 2, 3, 2);
+    test(S("abcde"), 4, 1, S("abcde"), 2, 4, 2);
+    test(S("abcde"), 4, 1, S("abcde"), 4, 0, 1);
+    test(S("abcde"), 4, 1, S("abcde"), 4, 1, 0);
+    test(S("abcde"), 4, 1, S("abcde"), 4, 2, 0);
+    test(S("abcde"), 4, 1, S("abcde"), 5, 0, 1);
+    test(S("abcde"), 4, 1, S("abcde"), 5, 1, 1);
+    test(S("abcde"), 4, 1, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 0, 1, 4);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 0, 5, 4);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 0, 9, 4);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 0, 10, 4);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 0, 11, 4);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 1, 1, 3);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 1, 4, 3);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 1, 8, 3);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 1, 9, 3);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 1, 10, 3);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 5, 2, -1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 5, 4, -1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 5, 5, -1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 5, 6, -1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 9, 1, -5);
+}
+
+template <class S>
+void test16()
+{
+    test(S("abcde"), 4, 1, S("abcdefghij"), 9, 2, -5);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcde"), 4, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 0, 1, 4);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 0, 10, 4);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 0, 19, 4);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 0, 20, 4);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 0, 21, 4);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 1, 1, 3);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 1, 9, 3);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 1, 18, 3);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 1, 19, 3);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 1, 20, 3);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 10, 1, -6);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 10, 5, -6);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 10, 9, -6);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 10, 10, -6);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 10, 11, -6);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 19, 1, -15);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 19, 2, -15);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcde"), 4, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 4, 2, S(""), 0, 0, 1);
+    test(S("abcde"), 4, 2, S(""), 0, 1, 1);
+    test(S("abcde"), 4, 2, S(""), 1, 0, 0);
+    test(S("abcde"), 4, 2, S("abcde"), 0, 0, 1);
+    test(S("abcde"), 4, 2, S("abcde"), 0, 1, 4);
+    test(S("abcde"), 4, 2, S("abcde"), 0, 2, 4);
+    test(S("abcde"), 4, 2, S("abcde"), 0, 4, 4);
+    test(S("abcde"), 4, 2, S("abcde"), 0, 5, 4);
+    test(S("abcde"), 4, 2, S("abcde"), 0, 6, 4);
+    test(S("abcde"), 4, 2, S("abcde"), 1, 0, 1);
+    test(S("abcde"), 4, 2, S("abcde"), 1, 1, 3);
+    test(S("abcde"), 4, 2, S("abcde"), 1, 2, 3);
+    test(S("abcde"), 4, 2, S("abcde"), 1, 3, 3);
+    test(S("abcde"), 4, 2, S("abcde"), 1, 4, 3);
+    test(S("abcde"), 4, 2, S("abcde"), 1, 5, 3);
+    test(S("abcde"), 4, 2, S("abcde"), 2, 0, 1);
+    test(S("abcde"), 4, 2, S("abcde"), 2, 1, 2);
+    test(S("abcde"), 4, 2, S("abcde"), 2, 2, 2);
+    test(S("abcde"), 4, 2, S("abcde"), 2, 3, 2);
+    test(S("abcde"), 4, 2, S("abcde"), 2, 4, 2);
+    test(S("abcde"), 4, 2, S("abcde"), 4, 0, 1);
+    test(S("abcde"), 4, 2, S("abcde"), 4, 1, 0);
+    test(S("abcde"), 4, 2, S("abcde"), 4, 2, 0);
+    test(S("abcde"), 4, 2, S("abcde"), 5, 0, 1);
+    test(S("abcde"), 4, 2, S("abcde"), 5, 1, 1);
+    test(S("abcde"), 4, 2, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 0, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 0, 1, 4);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 0, 5, 4);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 0, 9, 4);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 0, 10, 4);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 0, 11, 4);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 1, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 1, 1, 3);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 1, 4, 3);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 1, 8, 3);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 1, 9, 3);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 1, 10, 3);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 5, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 5, 2, -1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 5, 4, -1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 5, 5, -1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 5, 6, -1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 9, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 9, 1, -5);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 9, 2, -5);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 10, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 10, 1, 1);
+    test(S("abcde"), 4, 2, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 0, 1, 4);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 0, 10, 4);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 0, 19, 4);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 0, 20, 4);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 0, 21, 4);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 1, 1, 3);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 1, 9, 3);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 1, 18, 3);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 1, 19, 3);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 1, 20, 3);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 10, 1, -6);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 10, 5, -6);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 10, 9, -6);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 10, 10, -6);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 10, 11, -6);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 19, 1, -15);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 19, 2, -15);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 20, 0, 1);
+}
+
+template <class S>
+void test17()
+{
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcde"), 4, 2, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 5, 0, S(""), 0, 0, 0);
+    test(S("abcde"), 5, 0, S(""), 0, 1, 0);
+    test(S("abcde"), 5, 0, S(""), 1, 0, 0);
+    test(S("abcde"), 5, 0, S("abcde"), 0, 0, 0);
+    test(S("abcde"), 5, 0, S("abcde"), 0, 1, -1);
+    test(S("abcde"), 5, 0, S("abcde"), 0, 2, -2);
+    test(S("abcde"), 5, 0, S("abcde"), 0, 4, -4);
+    test(S("abcde"), 5, 0, S("abcde"), 0, 5, -5);
+    test(S("abcde"), 5, 0, S("abcde"), 0, 6, -5);
+    test(S("abcde"), 5, 0, S("abcde"), 1, 0, 0);
+    test(S("abcde"), 5, 0, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 5, 0, S("abcde"), 1, 2, -2);
+    test(S("abcde"), 5, 0, S("abcde"), 1, 3, -3);
+    test(S("abcde"), 5, 0, S("abcde"), 1, 4, -4);
+    test(S("abcde"), 5, 0, S("abcde"), 1, 5, -4);
+    test(S("abcde"), 5, 0, S("abcde"), 2, 0, 0);
+    test(S("abcde"), 5, 0, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 5, 0, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 5, 0, S("abcde"), 2, 3, -3);
+    test(S("abcde"), 5, 0, S("abcde"), 2, 4, -3);
+    test(S("abcde"), 5, 0, S("abcde"), 4, 0, 0);
+    test(S("abcde"), 5, 0, S("abcde"), 4, 1, -1);
+    test(S("abcde"), 5, 0, S("abcde"), 4, 2, -1);
+    test(S("abcde"), 5, 0, S("abcde"), 5, 0, 0);
+    test(S("abcde"), 5, 0, S("abcde"), 5, 1, 0);
+    test(S("abcde"), 5, 0, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcde"), 5, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcde"), 5, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 5, 1, S(""), 0, 0, 0);
+    test(S("abcde"), 5, 1, S(""), 0, 1, 0);
+    test(S("abcde"), 5, 1, S(""), 1, 0, 0);
+    test(S("abcde"), 5, 1, S("abcde"), 0, 0, 0);
+    test(S("abcde"), 5, 1, S("abcde"), 0, 1, -1);
+    test(S("abcde"), 5, 1, S("abcde"), 0, 2, -2);
+    test(S("abcde"), 5, 1, S("abcde"), 0, 4, -4);
+    test(S("abcde"), 5, 1, S("abcde"), 0, 5, -5);
+    test(S("abcde"), 5, 1, S("abcde"), 0, 6, -5);
+    test(S("abcde"), 5, 1, S("abcde"), 1, 0, 0);
+    test(S("abcde"), 5, 1, S("abcde"), 1, 1, -1);
+    test(S("abcde"), 5, 1, S("abcde"), 1, 2, -2);
+    test(S("abcde"), 5, 1, S("abcde"), 1, 3, -3);
+    test(S("abcde"), 5, 1, S("abcde"), 1, 4, -4);
+    test(S("abcde"), 5, 1, S("abcde"), 1, 5, -4);
+    test(S("abcde"), 5, 1, S("abcde"), 2, 0, 0);
+    test(S("abcde"), 5, 1, S("abcde"), 2, 1, -1);
+    test(S("abcde"), 5, 1, S("abcde"), 2, 2, -2);
+    test(S("abcde"), 5, 1, S("abcde"), 2, 3, -3);
+    test(S("abcde"), 5, 1, S("abcde"), 2, 4, -3);
+    test(S("abcde"), 5, 1, S("abcde"), 4, 0, 0);
+    test(S("abcde"), 5, 1, S("abcde"), 4, 1, -1);
+    test(S("abcde"), 5, 1, S("abcde"), 4, 2, -1);
+    test(S("abcde"), 5, 1, S("abcde"), 5, 0, 0);
+}
+
+template <class S>
+void test18()
+{
+    test(S("abcde"), 5, 1, S("abcde"), 5, 1, 0);
+    test(S("abcde"), 5, 1, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 0, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 0, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 0, 5, -5);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 0, 9, -9);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 0, 10, -10);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 0, 11, -10);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 1, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 1, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 1, 4, -4);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 1, 8, -8);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 1, 9, -9);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 1, 10, -9);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 5, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 5, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 5, 2, -2);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 5, 4, -4);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 5, 5, -5);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 5, 6, -5);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 9, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 9, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 9, 2, -1);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 10, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 10, 1, 0);
+    test(S("abcde"), 5, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcde"), 5, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcde"), 6, 0, S(""), 0, 0, 0);
+    test(S("abcde"), 6, 0, S(""), 0, 1, 0);
+    test(S("abcde"), 6, 0, S(""), 1, 0, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 0, 0, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 0, 1, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 0, 2, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 0, 4, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 0, 5, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 0, 6, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 1, 0, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 1, 1, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 1, 2, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 1, 3, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 1, 4, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 1, 5, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 2, 0, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 2, 1, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 2, 2, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 2, 3, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 2, 4, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 4, 0, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 4, 1, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 4, 2, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 5, 0, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 5, 1, 0);
+    test(S("abcde"), 6, 0, S("abcde"), 6, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 0, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 0, 5, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 0, 9, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 0, 10, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 0, 11, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 1, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 1, 4, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 1, 8, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 1, 9, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 1, 10, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 5, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 5, 2, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 5, 4, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 5, 5, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 5, 6, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 9, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 9, 2, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghij"), 11, 0, 0);
+}
+
+template <class S>
+void test19()
+{
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 0, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 0, 10, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 0, 19, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 0, 20, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 0, 21, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 1, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 1, 9, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 1, 18, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 1, 19, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 1, 20, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 10, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 10, 5, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 10, 9, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 10, 10, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 10, 11, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 19, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 19, 2, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcde"), 6, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 0, 0, S(""), 0, 0, 0);
+    test(S("abcdefghij"), 0, 0, S(""), 0, 1, 0);
+    test(S("abcdefghij"), 0, 0, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghij"), 0, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghij"), 0, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 0, 1, S(""), 0, 0, 1);
+    test(S("abcdefghij"), 0, 1, S(""), 0, 1, 1);
+}
+
+template <class S>
+void test20()
+{
+    test(S("abcdefghij"), 0, 1, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 0, 1, 0);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 0, 2, -1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 0, 4, -3);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 0, 5, -4);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 0, 6, -4);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 1, 2, -1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 1, 3, -1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 1, 5, -1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 2, 1, -2);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 2, 3, -2);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 2, 4, -2);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 4, 1, -4);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 4, 2, -4);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghij"), 0, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 0, 1, 0);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 0, 5, -4);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 0, 9, -8);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 0, 10, -9);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 0, 11, -9);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 0, 1, 0);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 0, 10, -9);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 0, 19, -18);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 0, 20, -19);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 0, 21, -19);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghij"), 0, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 0, 5, S(""), 0, 0, 5);
+    test(S("abcdefghij"), 0, 5, S(""), 0, 1, 5);
+    test(S("abcdefghij"), 0, 5, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 0, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 0, 1, 4);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 0, 2, 3);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 0, 4, 1);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 0, 5, 0);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 0, 6, 0);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 1, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 1, 2, -1);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 1, 3, -1);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 1, 5, -1);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 2, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 2, 1, -2);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 2, 3, -2);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 2, 4, -2);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 4, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 4, 1, -4);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 4, 2, -4);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 5, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 5, 1, 5);
+    test(S("abcdefghij"), 0, 5, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 0, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 0, 1, 4);
+}
+
+template <class S>
+void test21()
+{
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 0, 5, 0);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 0, 9, -4);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 0, 10, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 0, 11, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 1, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 5, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 9, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 10, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 10, 1, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 0, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 0, 1, 4);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 0, 10, -5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 0, 19, -14);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 0, 20, -15);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 0, 21, -15);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 1, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 10, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 19, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 20, 0, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 20, 1, 5);
+    test(S("abcdefghij"), 0, 5, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 0, 9, S(""), 0, 0, 9);
+    test(S("abcdefghij"), 0, 9, S(""), 0, 1, 9);
+    test(S("abcdefghij"), 0, 9, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 0, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 0, 1, 8);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 0, 2, 7);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 0, 4, 5);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 0, 5, 4);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 0, 6, 4);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 1, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 1, 2, -1);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 1, 3, -1);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 1, 5, -1);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 2, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 2, 1, -2);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 2, 3, -2);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 2, 4, -2);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 4, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 4, 1, -4);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 4, 2, -4);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 5, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 5, 1, 9);
+    test(S("abcdefghij"), 0, 9, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 0, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 0, 1, 8);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 0, 5, 4);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 0, 9, 0);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 0, 10, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 0, 11, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 1, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 5, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 9, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 10, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 10, 1, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 0, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 0, 1, 8);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 0, 10, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 0, 19, -10);
+}
+
+template <class S>
+void test22()
+{
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 0, 20, -11);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 0, 21, -11);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 1, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 10, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 19, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 20, 0, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 20, 1, 9);
+    test(S("abcdefghij"), 0, 9, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 0, 10, S(""), 0, 0, 10);
+    test(S("abcdefghij"), 0, 10, S(""), 0, 1, 10);
+    test(S("abcdefghij"), 0, 10, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 0, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 0, 1, 9);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 0, 2, 8);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 0, 4, 6);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 0, 5, 5);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 0, 6, 5);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 1, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 1, 2, -1);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 1, 3, -1);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 1, 5, -1);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 2, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 2, 1, -2);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 2, 3, -2);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 2, 4, -2);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 4, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 4, 1, -4);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 4, 2, -4);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 5, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 5, 1, 10);
+    test(S("abcdefghij"), 0, 10, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 0, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 0, 1, 9);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 0, 10, 0);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 0, 11, 0);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 1, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 5, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 9, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 10, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 10, 1, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 0, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 0, 1, 9);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 0, 10, 0);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 0, 19, -9);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 0, 20, -10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 0, 21, -10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 1, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 10, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 19, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 20, 0, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 20, 1, 10);
+    test(S("abcdefghij"), 0, 10, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 0, 11, S(""), 0, 0, 10);
+    test(S("abcdefghij"), 0, 11, S(""), 0, 1, 10);
+    test(S("abcdefghij"), 0, 11, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 0, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 0, 1, 9);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 0, 2, 8);
+}
+
+template <class S>
+void test23()
+{
+    test(S("abcdefghij"), 0, 11, S("abcde"), 0, 4, 6);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 0, 5, 5);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 0, 6, 5);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 1, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 1, 2, -1);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 1, 3, -1);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 1, 5, -1);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 2, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 2, 1, -2);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 2, 3, -2);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 2, 4, -2);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 4, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 4, 1, -4);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 4, 2, -4);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 5, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 5, 1, 10);
+    test(S("abcdefghij"), 0, 11, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 0, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 0, 1, 9);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 0, 10, 0);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 0, 11, 0);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 1, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 5, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 9, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 10, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 10, 1, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 0, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 0, 1, 9);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 0, 10, 0);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 0, 19, -9);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 0, 20, -10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 0, 21, -10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 1, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 10, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 19, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 20, 0, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 20, 1, 10);
+    test(S("abcdefghij"), 0, 11, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 1, 0, S(""), 0, 0, 0);
+    test(S("abcdefghij"), 1, 0, S(""), 0, 1, 0);
+    test(S("abcdefghij"), 1, 0, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghij"), 1, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 0, 11, -10);
+}
+
+template <class S>
+void test24()
+{
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghij"), 1, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 1, 1, S(""), 0, 0, 1);
+    test(S("abcdefghij"), 1, 1, S(""), 0, 1, 1);
+    test(S("abcdefghij"), 1, 1, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 0, 2, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 0, 4, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 0, 6, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 1, 1, 0);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 1, 2, -1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 1, 3, -2);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 1, 4, -3);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 1, 5, -3);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 2, 2, -1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 2, 3, -1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 2, 4, -1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 4, 1, -3);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 4, 2, -3);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghij"), 1, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 1, 1, 0);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 1, 4, -3);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 1, 8, -7);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 1, 9, -8);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 1, 10, -8);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 1, 1, 0);
+}
+
+template <class S>
+void test25()
+{
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 1, 9, -8);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 1, 18, -17);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 1, 19, -18);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 1, 20, -18);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghij"), 1, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 1, 4, S(""), 0, 0, 4);
+    test(S("abcdefghij"), 1, 4, S(""), 0, 1, 4);
+    test(S("abcdefghij"), 1, 4, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 0, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 0, 2, 1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 0, 4, 1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 0, 6, 1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 1, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 1, 1, 3);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 1, 2, 2);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 1, 3, 1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 1, 4, 0);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 1, 5, 0);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 2, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 2, 2, -1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 2, 3, -1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 2, 4, -1);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 4, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 4, 1, -3);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 4, 2, -3);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 5, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 5, 1, 4);
+    test(S("abcdefghij"), 1, 4, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 0, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 1, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 1, 1, 3);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 1, 4, 0);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 1, 8, -4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 1, 9, -5);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 1, 10, -5);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 5, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 9, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 10, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 10, 1, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 0, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 1, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 1, 1, 3);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 1, 9, -5);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 1, 18, -14);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 1, 19, -15);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 1, 20, -15);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 10, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 19, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 20, 0, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 20, 1, 4);
+    test(S("abcdefghij"), 1, 4, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 1, 8, S(""), 0, 0, 8);
+    test(S("abcdefghij"), 1, 8, S(""), 0, 1, 8);
+    test(S("abcdefghij"), 1, 8, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 0, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 0, 2, 1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 0, 4, 1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 0, 6, 1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 1, 0, 8);
+}
+
+template <class S>
+void test26()
+{
+    test(S("abcdefghij"), 1, 8, S("abcde"), 1, 1, 7);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 1, 2, 6);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 1, 3, 5);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 1, 4, 4);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 1, 5, 4);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 2, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 2, 2, -1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 2, 3, -1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 2, 4, -1);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 4, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 4, 1, -3);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 4, 2, -3);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 5, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 5, 1, 8);
+    test(S("abcdefghij"), 1, 8, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 0, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 1, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 1, 1, 7);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 1, 4, 4);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 1, 8, 0);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 5, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 9, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 10, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 10, 1, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 0, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 1, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 1, 1, 7);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 1, 18, -10);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 1, 19, -11);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 1, 20, -11);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 10, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 19, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 20, 0, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 20, 1, 8);
+    test(S("abcdefghij"), 1, 8, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 1, 9, S(""), 0, 0, 9);
+    test(S("abcdefghij"), 1, 9, S(""), 0, 1, 9);
+    test(S("abcdefghij"), 1, 9, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 0, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 0, 2, 1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 0, 4, 1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 0, 6, 1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 1, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 1, 1, 8);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 1, 2, 7);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 1, 3, 6);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 1, 4, 5);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 1, 5, 5);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 2, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 2, 2, -1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 2, 3, -1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 2, 4, -1);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 4, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 4, 1, -3);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 4, 2, -3);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 5, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 5, 1, 9);
+    test(S("abcdefghij"), 1, 9, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 0, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 1, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 1, 1, 8);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 1, 4, 5);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 1, 8, 1);
+}
+
+template <class S>
+void test27()
+{
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 1, 9, 0);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 1, 10, 0);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 5, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 9, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 10, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 10, 1, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 0, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 1, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 1, 1, 8);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 1, 9, 0);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 1, 18, -9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 1, 19, -10);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 1, 20, -10);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 10, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 19, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 20, 0, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 20, 1, 9);
+    test(S("abcdefghij"), 1, 9, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 1, 10, S(""), 0, 0, 9);
+    test(S("abcdefghij"), 1, 10, S(""), 0, 1, 9);
+    test(S("abcdefghij"), 1, 10, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 0, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 0, 2, 1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 0, 4, 1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 0, 6, 1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 1, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 1, 1, 8);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 1, 2, 7);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 1, 3, 6);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 1, 4, 5);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 1, 5, 5);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 2, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 2, 2, -1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 2, 3, -1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 2, 4, -1);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 4, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 4, 1, -3);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 4, 2, -3);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 5, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 5, 1, 9);
+    test(S("abcdefghij"), 1, 10, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 0, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 1, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 1, 1, 8);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 1, 4, 5);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 1, 8, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 1, 9, 0);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 1, 10, 0);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 5, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 9, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 10, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 10, 1, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 0, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 1, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 1, 1, 8);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 1, 9, 0);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 1, 18, -9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 1, 19, -10);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 1, 20, -10);
+}
+
+template <class S>
+void test28()
+{
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 10, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 19, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 20, 0, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 20, 1, 9);
+    test(S("abcdefghij"), 1, 10, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 5, 0, S(""), 0, 0, 0);
+    test(S("abcdefghij"), 5, 0, S(""), 0, 1, 0);
+    test(S("abcdefghij"), 5, 0, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghij"), 5, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghij"), 5, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 5, 1, S(""), 0, 0, 1);
+    test(S("abcdefghij"), 5, 1, S(""), 0, 1, 1);
+    test(S("abcdefghij"), 5, 1, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 0, 2, 5);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 0, 4, 5);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 0, 6, 5);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 1, 2, 4);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 1, 3, 4);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 1, 4, 4);
+}
+
+template <class S>
+void test29()
+{
+    test(S("abcdefghij"), 5, 1, S("abcde"), 1, 5, 4);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 2, 1, 3);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 2, 2, 3);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 2, 3, 3);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 2, 4, 3);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 4, 1, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 4, 2, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghij"), 5, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 0, 9, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 0, 11, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 1, 8, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 1, 10, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 5, 1, 0);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 5, 2, -1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 5, 4, -3);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 9, 1, -4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 9, 2, -4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 0, 19, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 0, 20, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 0, 21, 5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 1, 18, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 1, 19, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 1, 20, 4);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 10, 1, -5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 10, 9, -5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 10, 10, -5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 10, 11, -5);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 19, 1, -14);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 19, 2, -14);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghij"), 5, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 5, 2, S(""), 0, 0, 2);
+    test(S("abcdefghij"), 5, 2, S(""), 0, 1, 2);
+    test(S("abcdefghij"), 5, 2, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 0, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 0, 2, 5);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 0, 4, 5);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 0, 6, 5);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 1, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 1, 2, 4);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 1, 3, 4);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 1, 5, 4);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 2, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 2, 1, 3);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 2, 2, 3);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 2, 3, 3);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 2, 4, 3);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 4, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 4, 1, 1);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 4, 2, 1);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 5, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 5, 1, 2);
+    test(S("abcdefghij"), 5, 2, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 0, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 0, 9, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 0, 11, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 1, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 1, 8, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 1, 10, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 5, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 5, 1, 1);
+}
+
+template <class S>
+void test30()
+{
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 5, 2, 0);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 5, 4, -2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 5, 5, -3);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 5, 6, -3);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 9, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 9, 1, -4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 9, 2, -4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 10, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 10, 1, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 0, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 0, 19, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 0, 20, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 0, 21, 5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 1, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 1, 18, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 1, 19, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 1, 20, 4);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 10, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 10, 1, -5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 10, 9, -5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 10, 10, -5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 10, 11, -5);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 19, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 19, 1, -14);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 19, 2, -14);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 20, 0, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 20, 1, 2);
+    test(S("abcdefghij"), 5, 2, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 5, 4, S(""), 0, 0, 4);
+    test(S("abcdefghij"), 5, 4, S(""), 0, 1, 4);
+    test(S("abcdefghij"), 5, 4, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 0, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 0, 2, 5);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 0, 4, 5);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 0, 6, 5);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 1, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 1, 2, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 1, 3, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 1, 5, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 2, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 2, 1, 3);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 2, 2, 3);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 2, 3, 3);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 2, 4, 3);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 4, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 4, 1, 1);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 4, 2, 1);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 5, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 5, 1, 4);
+    test(S("abcdefghij"), 5, 4, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 0, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 0, 9, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 0, 11, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 1, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 1, 8, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 1, 10, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 5, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 5, 1, 3);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 5, 2, 2);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 5, 4, 0);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 5, 5, -1);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 5, 6, -1);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 9, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 9, 1, -4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 9, 2, -4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 10, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 10, 1, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 0, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 0, 19, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 0, 20, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 0, 21, 5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 1, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 1, 18, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 1, 19, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 1, 20, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 10, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 10, 1, -5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 10, 9, -5);
+}
+
+template <class S>
+void test31()
+{
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 10, 10, -5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 10, 11, -5);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 19, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 19, 1, -14);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 19, 2, -14);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 20, 0, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 20, 1, 4);
+    test(S("abcdefghij"), 5, 4, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 5, 5, S(""), 0, 0, 5);
+    test(S("abcdefghij"), 5, 5, S(""), 0, 1, 5);
+    test(S("abcdefghij"), 5, 5, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 0, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 0, 2, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 0, 4, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 0, 6, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 1, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 1, 2, 4);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 1, 3, 4);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 1, 5, 4);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 2, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 2, 1, 3);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 2, 2, 3);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 2, 3, 3);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 2, 4, 3);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 4, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 4, 1, 1);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 4, 2, 1);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 5, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 5, 1, 5);
+    test(S("abcdefghij"), 5, 5, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 0, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 0, 9, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 0, 11, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 1, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 1, 8, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 1, 10, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 5, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 5, 1, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 5, 2, 3);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 5, 4, 1);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 5, 5, 0);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 5, 6, 0);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 9, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 9, 1, -4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 9, 2, -4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 10, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 10, 1, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 0, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 0, 19, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 0, 20, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 0, 21, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 1, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 1, 18, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 1, 19, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 1, 20, 4);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 10, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 10, 1, -5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 10, 9, -5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 10, 10, -5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 10, 11, -5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 19, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 19, 1, -14);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 19, 2, -14);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 20, 0, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 20, 1, 5);
+    test(S("abcdefghij"), 5, 5, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 5, 6, S(""), 0, 0, 5);
+    test(S("abcdefghij"), 5, 6, S(""), 0, 1, 5);
+    test(S("abcdefghij"), 5, 6, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 0, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 0, 2, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 0, 4, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 0, 6, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 1, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 1, 2, 4);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 1, 3, 4);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 1, 5, 4);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 2, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 2, 1, 3);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 2, 2, 3);
+}
+
+template <class S>
+void test32()
+{
+    test(S("abcdefghij"), 5, 6, S("abcde"), 2, 3, 3);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 2, 4, 3);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 4, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 4, 1, 1);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 4, 2, 1);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 5, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 5, 1, 5);
+    test(S("abcdefghij"), 5, 6, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 0, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 0, 9, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 0, 11, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 1, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 1, 4, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 1, 8, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 1, 10, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 5, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 5, 1, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 5, 2, 3);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 5, 4, 1);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 5, 5, 0);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 5, 6, 0);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 9, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 9, 1, -4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 9, 2, -4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 10, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 10, 1, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 0, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 0, 1, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 0, 10, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 0, 19, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 0, 20, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 0, 21, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 1, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 1, 1, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 1, 9, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 1, 18, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 1, 19, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 1, 20, 4);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 10, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 10, 1, -5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 10, 9, -5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 10, 10, -5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 10, 11, -5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 19, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 19, 1, -14);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 19, 2, -14);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 20, 0, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 20, 1, 5);
+    test(S("abcdefghij"), 5, 6, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 9, 0, S(""), 0, 0, 0);
+    test(S("abcdefghij"), 9, 0, S(""), 0, 1, 0);
+    test(S("abcdefghij"), 9, 0, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghij"), 9, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 5, 6, -5);
+}
+
+template <class S>
+void test33()
+{
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghij"), 9, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 9, 1, S(""), 0, 0, 1);
+    test(S("abcdefghij"), 9, 1, S(""), 0, 1, 1);
+    test(S("abcdefghij"), 9, 1, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 0, 1, 9);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 0, 2, 9);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 0, 4, 9);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 0, 5, 9);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 0, 6, 9);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 1, 1, 8);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 1, 2, 8);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 1, 3, 8);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 1, 4, 8);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 1, 5, 8);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 2, 1, 7);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 2, 2, 7);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 2, 3, 7);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 2, 4, 7);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 4, 1, 5);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 4, 2, 5);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghij"), 9, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 0, 1, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 0, 5, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 0, 9, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 0, 10, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 0, 11, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 1, 1, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 1, 4, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 1, 8, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 1, 9, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 1, 10, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 5, 1, 4);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 5, 2, 4);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 5, 4, 4);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 5, 5, 4);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 5, 6, 4);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 9, 1, 0);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 9, 2, 0);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 0, 1, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 0, 10, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 0, 19, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 0, 20, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 0, 21, 9);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 1, 1, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 1, 9, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 1, 18, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 1, 19, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 1, 20, 8);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 10, 5, -1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 10, 9, -1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 10, 10, -1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 10, 11, -1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 19, 1, -10);
+}
+
+template <class S>
+void test34()
+{
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 19, 2, -10);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghij"), 9, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 9, 2, S(""), 0, 0, 1);
+    test(S("abcdefghij"), 9, 2, S(""), 0, 1, 1);
+    test(S("abcdefghij"), 9, 2, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 0, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 0, 1, 9);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 0, 2, 9);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 0, 4, 9);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 0, 5, 9);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 0, 6, 9);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 1, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 1, 1, 8);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 1, 2, 8);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 1, 3, 8);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 1, 4, 8);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 1, 5, 8);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 2, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 2, 1, 7);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 2, 2, 7);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 2, 3, 7);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 2, 4, 7);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 4, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 4, 1, 5);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 4, 2, 5);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 5, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 5, 1, 1);
+    test(S("abcdefghij"), 9, 2, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 0, 1, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 0, 5, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 0, 9, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 0, 10, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 0, 11, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 1, 1, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 1, 4, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 1, 8, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 1, 9, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 1, 10, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 5, 1, 4);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 5, 2, 4);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 5, 4, 4);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 5, 5, 4);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 5, 6, 4);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 9, 1, 0);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 9, 2, 0);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 0, 1, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 0, 10, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 0, 19, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 0, 20, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 0, 21, 9);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 1, 1, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 1, 9, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 1, 18, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 1, 19, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 1, 20, 8);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 10, 5, -1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 10, 9, -1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 10, 10, -1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 10, 11, -1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 19, 1, -10);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 19, 2, -10);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghij"), 9, 2, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 10, 0, S(""), 0, 0, 0);
+    test(S("abcdefghij"), 10, 0, S(""), 0, 1, 0);
+    test(S("abcdefghij"), 10, 0, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 4, 1, -1);
+}
+
+template <class S>
+void test35()
+{
+    test(S("abcdefghij"), 10, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghij"), 10, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghij"), 10, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 10, 1, S(""), 0, 0, 0);
+    test(S("abcdefghij"), 10, 1, S(""), 0, 1, 0);
+    test(S("abcdefghij"), 10, 1, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 0, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 0, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 0, 2, -2);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 0, 4, -4);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 0, 5, -5);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 0, 6, -5);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 1, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 1, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 1, 2, -2);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 1, 3, -3);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 1, 4, -4);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 1, 5, -4);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 2, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 2, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 2, 2, -2);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 2, 3, -3);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 2, 4, -3);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 4, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 4, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 4, 2, -1);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 5, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 5, 1, 0);
+    test(S("abcdefghij"), 10, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 10, 0, 0);
+}
+
+template <class S>
+void test36()
+{
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghij"), 10, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghij"), 11, 0, S(""), 0, 0, 0);
+    test(S("abcdefghij"), 11, 0, S(""), 0, 1, 0);
+    test(S("abcdefghij"), 11, 0, S(""), 1, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 0, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 0, 2, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 0, 4, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 0, 5, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 0, 6, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 1, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 1, 2, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 1, 3, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 1, 4, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 1, 5, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 2, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 2, 2, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 2, 3, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 2, 4, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 4, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 4, 2, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 0, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 0, 5, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 0, 9, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 0, 10, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 0, 11, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 1, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 1, 4, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 1, 8, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 1, 9, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 1, 10, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 5, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 5, 2, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 5, 4, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 5, 5, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 5, 6, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 9, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 9, 2, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 0, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 0, 10, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 0, 19, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 0, 20, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 0, 21, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 1, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 1, 9, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 1, 18, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 1, 19, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 1, 20, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 10, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 10, 5, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 10, 9, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 10, 10, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 10, 11, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 19, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 19, 2, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghij"), 11, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+}
+
+template <class S>
+void test37()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 0, S(""), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S(""), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S(""), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S(""), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 0, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 0, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 0, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 0, 6, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 1, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 1, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 1, 5, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 2, 1, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 2, 3, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 2, 4, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 4, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 4, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcde"), 6, 0, 0);
+}
+
+template <class S>
+void test38()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 0, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 0, 9, -8);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 0, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 0, 11, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 0, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 0, 19, -18);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 0, 20, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 0, 21, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S(""), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S(""), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 0, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 0, 2, 8);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 0, 4, 6);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 0, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 0, 6, 5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 1, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 1, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 1, 5, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 2, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 2, 1, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 2, 3, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 2, 4, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 4, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 4, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 4, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 5, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 5, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 0, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 0, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 0, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 0, 11, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 5, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 9, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 10, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 10, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 0, 1, 9);
+}
+
+template <class S>
+void test39()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 0, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 0, 19, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 0, 20, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 0, 21, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 10, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 19, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 20, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 20, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 10, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S(""), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S(""), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 0, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 0, 2, 17);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 0, 4, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 0, 5, 14);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 0, 6, 14);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 1, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 1, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 1, 5, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 2, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 2, 1, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 2, 3, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 2, 4, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 4, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 4, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 4, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 5, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 5, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 0, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 0, 5, 14);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 0, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 0, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 0, 11, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 5, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 9, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 10, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 10, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 0, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 0, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 0, 19, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 0, 20, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 0, 21, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 10, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 19, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 20, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 20, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 19, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S(""), 0, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S(""), 0, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 0, 0, 20);
+}
+
+template <class S>
+void test40()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 0, 2, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 0, 4, 16);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 0, 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 0, 6, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 1, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 1, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 1, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 1, 5, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 2, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 2, 1, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 2, 3, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 2, 4, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 4, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 4, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 4, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 5, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 5, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 0, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 0, 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 0, 9, 11);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 0, 11, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 1, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 5, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 9, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 10, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 10, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 0, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 0, 20, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 0, 21, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 1, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 10, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 19, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 20, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 20, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 20, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S(""), 0, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S(""), 0, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 0, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 0, 2, 18);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 0, 4, 16);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 0, 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 0, 6, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 1, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 1, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 1, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 1, 5, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 2, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 2, 1, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 2, 3, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 2, 4, -2);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 4, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 4, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 4, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 5, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 5, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 0, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 0, 5, 15);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 0, 9, 11);
+}
+
+template <class S>
+void test41()
+{
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 0, 11, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 1, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 1, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 1, 8, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 1, 10, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 5, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 5, 1, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 5, 2, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 5, 4, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 9, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 9, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 9, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 10, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 10, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 0, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 0, 20, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 0, 21, 0);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 1, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 1, 9, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 1, 18, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 10, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 10, 1, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 10, 5, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 10, 9, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 19, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 19, 1, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 19, 2, -19);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 20, 0, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 20, 1, 20);
+    test(S("abcdefghijklmnopqrst"), 0, 21, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S(""), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S(""), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+}
+
+template <class S>
+void test42()
+{
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S(""), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S(""), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 0, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 0, 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 0, 6, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 1, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 1, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 1, 3, -2);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 1, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 1, 5, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 2, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 2, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 2, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 4, 1, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 4, 2, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 1, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 1, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 1, 8, -7);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 1, 9, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 1, 10, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 1, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 1, 9, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 1, 18, -17);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 1, 19, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 1, 20, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S(""), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S(""), 0, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 0, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 0, 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 0, 5, 1);
+}
+
+template <class S>
+void test43()
+{
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 0, 6, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 1, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 1, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 1, 2, 7);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 1, 3, 6);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 1, 4, 5);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 1, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 2, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 2, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 2, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 2, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 4, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 4, 1, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 4, 2, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 5, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 5, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 1, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 1, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 1, 4, 5);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 1, 8, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 1, 9, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 1, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 5, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 9, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 10, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 10, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 1, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 1, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 1, 9, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 1, 18, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 1, 19, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 1, 20, -10);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 10, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 19, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 20, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 20, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 9, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S(""), 0, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S(""), 0, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 0, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 0, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 0, 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 0, 6, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 1, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 1, 1, 17);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 1, 2, 16);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 1, 3, 15);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 1, 4, 14);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 1, 5, 14);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 2, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 2, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 2, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 2, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 4, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 4, 1, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 4, 2, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 5, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 5, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 0, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 1, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 1, 1, 17);
+}
+
+template <class S>
+void test44()
+{
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 1, 4, 14);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 1, 8, 10);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 1, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 5, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 9, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 10, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 10, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 0, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 1, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 1, 1, 17);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 1, 18, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 1, 19, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 1, 20, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 10, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 19, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 20, 0, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 20, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 18, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S(""), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S(""), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 0, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 0, 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 0, 6, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 1, 2, 17);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 1, 3, 16);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 1, 4, 15);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 1, 5, 15);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 2, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 2, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 2, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 2, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 4, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 4, 1, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 4, 2, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 5, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 5, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 1, 4, 15);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 1, 8, 11);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 1, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 1, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 5, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 9, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 10, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 10, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 1, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 1, 18, 1);
+}
+
+template <class S>
+void test45()
+{
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 1, 19, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 1, 20, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 10, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 19, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 20, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 20, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 19, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S(""), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S(""), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 0, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 0, 4, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 0, 6, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 1, 2, 17);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 1, 3, 16);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 1, 4, 15);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 1, 5, 15);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 2, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 2, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 2, 3, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 2, 4, -1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 4, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 4, 1, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 4, 2, -3);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 5, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 5, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 0, 5, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 0, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 0, 11, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 1, 4, 15);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 1, 8, 11);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 1, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 1, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 5, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 5, 1, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 5, 2, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 5, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 5, 6, -4);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 9, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 9, 1, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 9, 2, -8);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 10, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 10, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 0, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 0, 10, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 0, 19, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 0, 20, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 0, 21, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 1, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 1, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 1, 18, 1);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 1, 19, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 1, 20, 0);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 10, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 10, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 10, 5, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 19, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 19, 1, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 19, 2, -18);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 20, 0, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 20, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 1, 20, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S(""), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S(""), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 1, 2, -2);
+}
+
+template <class S>
+void test46()
+{
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S(""), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S(""), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 0, 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 0, 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 0, 6, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 1, 2, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 1, 3, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 1, 5, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 2, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 2, 2, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 2, 3, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 2, 4, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 4, 1, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 4, 2, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 0, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 0, 11, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 1, 8, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 1, 10, 9);
+}
+
+template <class S>
+void test47()
+{
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 5, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 5, 2, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 5, 4, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 5, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 5, 6, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 9, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 9, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 0, 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 0, 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 0, 21, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 1, 18, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 1, 19, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 1, 20, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 10, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 10, 9, -8);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 10, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 10, 11, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 19, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 19, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S(""), 0, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S(""), 0, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 0, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 0, 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 0, 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 0, 6, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 1, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 1, 2, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 1, 3, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 1, 5, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 2, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 2, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 2, 2, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 2, 3, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 2, 4, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 4, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 4, 1, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 4, 2, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 5, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 5, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 0, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 0, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 0, 11, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 1, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 1, 8, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 1, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 5, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 5, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 5, 2, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 5, 4, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 5, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 5, 6, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 9, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 9, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 9, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 10, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 10, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 0, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 0, 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 0, 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 0, 21, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 1, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 1, 18, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 1, 19, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 1, 20, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 10, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 10, 1, 4);
+}
+
+template <class S>
+void test48()
+{
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 10, 5, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 10, 9, -4);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 10, 10, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 10, 11, -5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 19, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 19, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 19, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 20, 0, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 20, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 5, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S(""), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S(""), 0, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 0, 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 0, 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 0, 6, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 1, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 1, 2, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 1, 3, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 1, 5, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 2, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 2, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 2, 2, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 2, 3, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 2, 4, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 4, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 4, 1, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 4, 2, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 5, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 5, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 0, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 0, 11, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 1, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 1, 8, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 1, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 5, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 5, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 5, 2, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 5, 4, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 5, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 5, 6, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 9, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 9, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 9, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 10, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 10, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 0, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 0, 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 0, 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 0, 21, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 1, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 1, 18, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 1, 19, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 1, 20, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 10, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 10, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 10, 5, 4);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 10, 9, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 10, 10, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 10, 11, -1);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 19, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 19, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 19, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 20, 0, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 20, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 9, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S(""), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S(""), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 0, 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 0, 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 0, 6, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 1, 2, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 1, 3, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 1, 5, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 2, 0, 10);
+}
+
+template <class S>
+void test49()
+{
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 2, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 2, 2, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 2, 3, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 2, 4, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 4, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 4, 1, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 4, 2, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 5, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 5, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 0, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 0, 11, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 1, 8, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 1, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 5, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 5, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 5, 2, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 5, 4, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 5, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 5, 6, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 9, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 9, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 9, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 10, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 10, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 0, 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 0, 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 0, 21, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 1, 18, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 1, 19, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 1, 20, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 10, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 10, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 10, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 10, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 10, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 10, 11, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 19, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 19, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 19, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 20, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 20, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 10, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S(""), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S(""), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 0, 2, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 0, 4, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 0, 6, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 1, 2, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 1, 3, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 1, 5, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 2, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 2, 1, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 2, 2, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 2, 3, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 2, 4, 8);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 4, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 4, 1, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 4, 2, 6);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 5, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 5, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 0, 5, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 0, 9, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 0, 11, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 1, 4, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 1, 8, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 1, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 5, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 5, 1, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 5, 2, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 5, 4, 5);
+}
+
+template <class S>
+void test50()
+{
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 5, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 5, 6, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 9, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 9, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 9, 2, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 10, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 10, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 0, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 0, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 0, 10, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 0, 19, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 0, 20, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 0, 21, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 1, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 1, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 1, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 1, 18, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 1, 19, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 1, 20, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 10, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 10, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 10, 5, 5);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 10, 9, 1);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 10, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 10, 11, 0);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 19, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 19, 1, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 19, 2, -9);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 20, 0, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 20, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 10, 11, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S(""), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S(""), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+}
+
+template <class S>
+void test51()
+{
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S(""), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S(""), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 0, 2, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 0, 4, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 0, 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 0, 6, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 1, 2, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 1, 3, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 1, 4, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 1, 5, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 2, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 2, 1, 17);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 2, 2, 17);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 2, 3, 17);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 2, 4, 17);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 4, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 4, 1, 15);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 4, 2, 15);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 5, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 0, 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 0, 9, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 0, 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 0, 11, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 1, 4, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 1, 8, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 1, 9, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 1, 10, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 5, 1, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 5, 2, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 5, 4, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 5, 5, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 5, 6, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 9, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 9, 2, 10);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 0, 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 0, 19, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 0, 20, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 0, 21, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 1, 9, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 1, 18, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 1, 19, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 1, 20, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 10, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 10, 5, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 10, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 10, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 10, 11, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 19, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 19, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S(""), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S(""), 0, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 0, 2, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 0, 4, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 0, 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 0, 6, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 1, 2, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 1, 3, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 1, 4, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 1, 5, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 2, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 2, 1, 17);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 2, 2, 17);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 2, 3, 17);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 2, 4, 17);
+}
+
+template <class S>
+void test52()
+{
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 4, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 4, 1, 15);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 4, 2, 15);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 5, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 0, 5, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 0, 9, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 0, 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 0, 11, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 1, 4, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 1, 8, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 1, 9, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 1, 10, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 5, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 5, 1, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 5, 2, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 5, 4, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 5, 5, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 5, 6, 14);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 9, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 9, 1, 10);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 9, 2, 10);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 10, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 0, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 0, 1, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 0, 10, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 0, 19, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 0, 20, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 0, 21, 19);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 1, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 1, 1, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 1, 9, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 1, 18, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 1, 19, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 1, 20, 18);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 10, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 10, 1, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 10, 5, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 10, 9, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 10, 10, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 10, 11, 9);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 19, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 19, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 19, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 20, 0, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 20, 1, 1);
+    test(S("abcdefghijklmnopqrst"), 19, 2, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S(""), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S(""), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 0, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 0, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 0, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 1, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 1, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 1, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 2, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 2, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 4, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 4, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 9, 1, -1);
+}
+
+template <class S>
+void test53()
+{
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S(""), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S(""), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 0, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 0, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 0, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 1, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 1, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 1, 5, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 2, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 2, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 2, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 2, 3, -3);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 2, 4, -3);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 4, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 4, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 4, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 0, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 0, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 0, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 1, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 1, 8, -8);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 1, 10, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 5, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 5, 2, -2);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 5, 4, -4);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 5, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 5, 6, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 9, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 9, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 0, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 0, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 0, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 0, 20, -20);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 0, 21, -20);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 1, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 1, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 1, 18, -18);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 1, 19, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 1, 20, -19);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 10, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 10, 5, -5);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 10, 9, -9);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 10, 10, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 10, 11, -10);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 19, 1, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 19, 2, -1);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 20, 0, 0);
+}
+
+template <class S>
+void test54()
+{
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 20, 1, S("abcdefghijklmnopqrst"), 21, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S(""), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S(""), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S(""), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 0, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 0, 4, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 0, 5, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 0, 6, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 1, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 1, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 1, 3, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 1, 4, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 1, 5, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 2, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 2, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 2, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 2, 3, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 2, 4, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 4, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 4, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 4, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcde"), 6, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 0, 5, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 0, 9, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 0, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 0, 11, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 1, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 1, 4, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 1, 8, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 1, 9, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 1, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 5, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 5, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 5, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 5, 4, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 5, 5, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 5, 6, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 9, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 9, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 9, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghij"), 11, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0, 19, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0, 20, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 0, 21, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 1, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 1, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 1, 9, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 1, 18, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 1, 19, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 1, 20, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 10, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 10, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 10, 5, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 10, 9, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 10, 10, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 10, 11, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 19, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 19, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 19, 2, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 20, 0, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 20, 1, 0);
+    test(S("abcdefghijklmnopqrst"), 21, 0, S("abcdefghijklmnopqrst"), 21, 0, 0);
+}
+
+template<class S>
+void test55()
+{
+    test_npos(S(""), 0, 0, S(""), 0, 0);
+    test_npos(S(""), 0, 0, S("abcde"), 0, -5);
+    test_npos(S("abcde"), 0, 0, S("abcdefghij"), 0, -10);
+    test_npos(S("abcde"), 0, 0, S("abcdefghij"), 1, -9);
+    test_npos(S("abcde"), 0, 0, S("abcdefghij"), 5, -5);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    test4<S>();
+    test5<S>();
+    test6<S>();
+    test7<S>();
+    test8<S>();
+    test9<S>();
+    test10<S>();
+    test11<S>();
+    test12<S>();
+    test13<S>();
+    test14<S>();
+    test15<S>();
+    test16<S>();
+    test17<S>();
+    test18<S>();
+    test19<S>();
+    test20<S>();
+    test21<S>();
+    test22<S>();
+    test23<S>();
+    test24<S>();
+    test25<S>();
+    test26<S>();
+    test27<S>();
+    test28<S>();
+    test29<S>();
+    test30<S>();
+    test31<S>();
+    test32<S>();
+    test33<S>();
+    test34<S>();
+    test35<S>();
+    test36<S>();
+    test37<S>();
+    test38<S>();
+    test39<S>();
+    test40<S>();
+    test41<S>();
+    test42<S>();
+    test43<S>();
+    test44<S>();
+    test45<S>();
+    test46<S>();
+    test47<S>();
+    test48<S>();
+    test49<S>();
+    test50<S>();
+    test51<S>();
+    test52<S>();
+    test53<S>();
+    test54<S>();
+    test55<S>();
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    test4<S>();
+    test5<S>();
+    test6<S>();
+    test7<S>();
+    test8<S>();
+    test9<S>();
+    test10<S>();
+    test11<S>();
+    test12<S>();
+    test13<S>();
+    test14<S>();
+    test15<S>();
+    test16<S>();
+    test17<S>();
+    test18<S>();
+    test19<S>();
+    test20<S>();
+    test21<S>();
+    test22<S>();
+    test23<S>();
+    test24<S>();
+    test25<S>();
+    test26<S>();
+    test27<S>();
+    test28<S>();
+    test29<S>();
+    test30<S>();
+    test31<S>();
+    test32<S>();
+    test33<S>();
+    test34<S>();
+    test35<S>();
+    test36<S>();
+    test37<S>();
+    test38<S>();
+    test39<S>();
+    test40<S>();
+    test41<S>();
+    test42<S>();
+    test43<S>();
+    test44<S>();
+    test45<S>();
+    test46<S>();
+    test47<S>();
+    test48<S>();
+    test49<S>();
+    test50<S>();
+    test51<S>();
+    test52<S>();
+    test53<S>();
+    test54<S>();
+    test55<S>();
+    }
+#endif
+}
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
new file mode 100644
index 00000000000..7de95a8cda5
--- /dev/null
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
@@ -0,0 +1,77 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// int compare(const basic_string& str) const
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+int sign(int x)
+{
+    if (x == 0)
+        return 0;
+    if (x < 0)
+        return -1;
+    return 1;
+}
+
+template <class S>
+void
+test(const S& s, const S& str, int x)
+{
+    assert(sign(s.compare(str)) == sign(x));
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    test(S(""), S(""), 0);
+    test(S(""), S("abcde"), -5);
+    test(S(""), S("abcdefghij"), -10);
+    test(S(""), S("abcdefghijklmnopqrst"), -20);
+    test(S("abcde"), S(""), 5);
+    test(S("abcde"), S("abcde"), 0);
+    test(S("abcde"), S("abcdefghij"), -5);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), -15);
+    test(S("abcdefghij"), S(""), 10);
+    test(S("abcdefghij"), S("abcde"), 5);
+    test(S("abcdefghij"), S("abcdefghij"), 0);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), -10);
+    test(S("abcdefghijklmnopqrst"), S(""), 20);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), 15);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), 0);
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test(S(""), S(""), 0);
+    test(S(""), S("abcde"), -5);
+    test(S(""), S("abcdefghij"), -10);
+    test(S(""), S("abcdefghijklmnopqrst"), -20);
+    test(S("abcde"), S(""), 5);
+    test(S("abcde"), S("abcde"), 0);
+    test(S("abcde"), S("abcdefghij"), -5);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), -15);
+    test(S("abcdefghij"), S(""), 10);
+    test(S("abcdefghij"), S("abcde"), 5);
+    test(S("abcdefghij"), S("abcdefghij"), 0);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), -10);
+    test(S("abcdefghijklmnopqrst"), S(""), 20);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), 15);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), 10);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), 0);
+    }
+#endif
+}