32:my $only_unique = 1;    # eliminate numbers that are just a reordering of digits

43:    ## we store only unique "constellations" of digits by sorting and using the
44:    ## hash to remove duplicates. we also must sort the value it points to.
45:    if ($only_unique) {$n = sortHiLow($n);
46:                       $nn = sortHiLow($nn);}