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A: abbaba
B: babbaaaa

A: abbaba
B: --babbaaaa

#!/usr/bin/perl

...
  return $random_string;
}

1:(1)(0,4)(bbab,bbbb)
2:(1)(0,4)(aaaa,aaba)
...
8:(1)(3,1)(baaa,bbba)
9:(1)(0,4)(aaab,baab)
10:(0)(0,4)(aaaa,aaaa)