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  1. or download this
    use strict;
use warnings;
...
A2;A3
A2;A4
A1;A3
  2. or download this
        A1  A2  A3  A4
A1   0   0   1   1
A2   0   0   1   1
A3   1   1   0   0
A4   1   1   0   0
  3. or download this
    use strict;
use warnings;
...
lion;mule
lion;tiger
horse;mule