=head1 polynumber binary pairs (bifields?) 0 00_00 -1 1 00_01 01_00 -2 2 00_10 10_00 -3 3 00_11 11_00 =cut #### =head1 polynumber binary pairs (bifields?) overlaps 1 -2 10_01 01_10 -1 1 01_10 10_01 -3 0 00_11 11_11 =cut