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for ($ref=0; $ref<$#items; $ref++) { for (@{$items[$ref]}) { if (!$contains{$_}) { $contains{$_} = [$ref]; } else { push @{ +$contains{$_}}, $ref; } } }
sub get_pairs { my %invalids = (); ... } @all_matches = get_pairs(2,3,4)
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