C312312111133131212111133133313231333133313331333133311211332211   >>    C31231211113313121211113313331323133313331333133313331121133221   <<    C312312111133131212111133133313231333133313331333133311211332213   >>      C312312111133131212111133133313231333133313331333133311211332212   >>