C312312111133131212111133133313231333132311331333133313232233312312121   >>    C31231211113313121211113313331323133313231133133313331323223331231212   <<    C312312111133131212111133133313231333132311331333133313232233312312123   >>      C312312111133131212111133133313231333132311331333133313232233312312122   >>