C312312111133131212111133133313231333133313331323221121133112121   >>    C31231211113313121211113313331323133313331333132322112113311212   <<    C312312111133131212111133133313231333133313331323221121133112123   >>      C312312111133131212111133133313231333133313331323221121133112122   >>