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  1. or download this
    sub compatible
    {
    ...
    
        print "$s1\n$s2\n", ($diff == 0) ? "compatible" : "incompatible", 
    +"\n\n";
    }
    
  2. or download this
    _8__3__19
    48____7__
    ...
    _8__3__19
    48_____7_
    incompatible
    
  3. or download this
    use strict;
    
    ...
        $s2 = shift(@tests);
        compatible($s1, $s2);
    }
    
  4. or download this
    _8__3__19
    48____7__
    ...
    _8__3__19
    48_____7_
    incompatible