C312312111133131212111133133313231333133313331323221133132322121   >>    C31231211113313121211113313331323133313331333132322113313232212   <<    C312312111133131212111133133313231333133313331323221133132322123   >>      C312312111133131212111133133313231333133313331323221133132322122   >>