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  1. or download this
    sub maximize_rows {
  my @array = @_;
...
7 = 6 7  1 8
8 = 4 5  2 3
9 = 3 5  1 7
  2. or download this
    @array = qw(1 1 1 2 3 4);

...
Unused 1: 1 4
Unused 2: 3 4
Unused 3: 2 4
  3. or download this
    sub get_pairs {
  my %hash = ();
...
Unused 3: 1 4
next
1 = 1 4  2 3