--stag=abx:abx             1x5x1x1:3x5x6x9
                           4x1x4x4:4x4x1x4
                           1x1x1x1:16x12x2x2
                           1x12:12x1

--stag=aBx8b:aBx16b  2x16x1x1:2x16x5x7

--stag=aBx16b:axb    1x16x5x7:2x16x5x7
                     2x16x1x1:2x16x1x1
