my %seen;
for my $arrayref (@all_inputs) {
  if ($arrayref->[0] && $arrayref->[1]) {
    # not interesting, just pass it through
    print_result($arrayref);
  } else {
    # get a signature, increase the count for that signature by 1
    ++$seen{ signature($arrayref) };
  }
}
# now construct combined results for the saved inputs
for my $sig (keys %seen) {
  my $count = $seen{$sig};
  my $arrayref = [ split /\./, $sig ];
  # keep it easy: multiplying the zero value is a noop
  $arrayref->[$_] *= $count for (0, 1);
  print_result($arrayref);
}