C312312111133131212111133133313231333132311331333133313232232221   >>    C31231211113313121211113313331323133313231133133313331323223222   <<    C312312111133131212111133133313231333132311331333133313232232223   >>      C312312111133131212111133133313231333132311331333133313232232222   >>