C312312111133131212111133133313331333133312133313231333133322122321   >>    C31231211113313121211113313331333133313331213331323133313332212232   <<    C312312111133131212111133133313331333133312133313231333133322122323   >>      C312312111133131212111133133313331333133312133313231333133322122322   >>