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  1. or download this
    use strict;
    use warnings;
    ...
    sub mk_key {
        join SEP, @_;
    }
    
  2. or download this
    [[2 .. 5], [2 .. 5], [2 .. 5]]
    [[2, 4, 3, 5], [2, 3, 5, 4], [2, 5, 3, 4]]
    [[3, 2, 4, 5], [4, 3, 2, 5], [2, 5, 4, 3]]
    [[5, 4, 3, 2], [4, 5, 2, 3], [5, 2, 3, 4]]
    
  3. or download this
    [[2 .. 5], [2 .. 5], [2 .. 5]]
    [[4, 5, 2, 3], [3, 5, 2, 4], [2, 5, 4, 3]]
    [[3, 2, 4, 5], [4, 3, 2, 5], [2, 5, 4, 3]]
    [[5, 4, 3, 2], [3, 4, 5, 2], [2, 5, 3, 4]]