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  1. or download this
    sub map_pairs(&@) {
      my $fn = shift;
    ...
        $fn->($a, $b);
      } (0..$#_/2);
    }
    
  2. or download this
    sub map_pairs(&@) {
      my $fn = shift;
    ...
        $fn->($a, $b);
      } (0..$#_/2);
    }