C312312111133131212111133133313231333133313331331121333132223221   >>    C31231211113313121211113313331323133313331333133112133313222322   <<    C312312111133131212111133133313231333133313331331121333132223223   >>      C312312111133131212111133133313231333133313331331121333132223222   >>