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  1. or download this
    If u have horse instead of A1 
          lion instead of A2
          mule instead of A3
          tiger instead of A4
  2. or download this
     
__DATA__
horse;tiger
lion;mule
lion;tiger
horse;mule
  3. or download this
    use strict;
use warnings;
...
  print "\n";
}
  4. or download this
    printing as 
    1  2  3  4  
...
3   0   0   0   0    
4   0   0   0   0
  5. or download this
      
      horse lion mule tiger
horse  0     0    1    1
lion   0     0    1    1
mule   1     1    0    0
tiger  1     1    0    0