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  1. or download this
     'key1' => ["A","B","C","D"],
 'key2' => ["A","C","B","C"],
 'key3' => ["C","A","D","H"],
 'key4' => ["A","B","I","C"],
  2. or download this
    [ "A", "A", "A", "A" ],
[ "B", "B", "-", "B" ],
[ "C", "C", "-", "C" ],
[ "D", "-", "D", "-" ],
  3. or download this
    my @output = ();
my @keys = sort keys %hash;
...
  }

}