9 ASSERT( strspn("aabbcd", "ab") == 4);
10 ASSERT( strspn("abbacd", "") == 0);
11 ASSERT( strspn("abbacd", "ac") == 1);
12 ASSERT( strspn("abbacd", "x") == 0);
13 ASSERT( strspn("abbacd", "c") == 0);
14 ASSERT( strspn("abbacd", "cba") == 5);
15 ASSERT( strspn("abbacd", "cdba") == 6);