C1a-C1b:*-O1a:C2c-C2y
C1a-C1x:*-N1y:C2c-C2y
C1b-C1y:*-C1y:C2b+C8y-C2x+C8y
C1c-C1y:C6a+*-*+C1y:C1b+N1a-C1x+N1y
N1a-N1y:*+*-C1a+C1x:C1c-C1y