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[a8 b4 c1 d3 e6 f2 g7 h5]
[a9 b7 c4 d2 e8 f6 g1 h3 i5]

  N       Original         Faster       Non-Pure
  4           0.06           0.05           0.04
...
 18                                        27.17
 19                                         1.89
 20

#!/usr/bin/perl
            
...
    print "\n";
    $N ++;
}