$ test.pl
ok 1 - 'ABBABAA' ~~~ 'BAABABA'
ok 2 - 'ABBABAA' ~!~ 'BAABBBA'
ok 3 - 'ABBABAA' ~!~ 'ABBABaA'
ok 4 - 'ABBABAA' ~!~ 'BAABBAA '
ok 5 - 'ABBABAA' ~!~ 'BAABABA '
ok 6 - 'ABBABAA' ~!~ 'BAABABAA'
1..6