C1b-C2a:O2b-*:C2b-C2b
C1b-C2x:*-*:C1b+C1y-C1x+C2y
C1y-C2y:*-*:C1b+C1z+C2y-C2x+C1z+C1y
C2a-C1x:*-C1z:C2y-C1y
C2c-C1z:*-C1x:C1a+C1b+C2b-C1a+C1x+C2b
C2y-C1y:*-*:C1x+C1y+C2a-C1x+C2y+C1x