C31231211111133131211113313331323133313331312121111331333232233132332211   >>    C3123121111113313121111331333132313331333131212111133133323223313233221   <<    C31231211111133131211113313331323133313331312121111331333232233132332213   >>      C31231211111133131211113313331323133313331312121111331333232233132332212   >>