C312312111111331312111133133313331333133313231333132212111133132212121   >>    C31231211111133131211113313331333133313331323133313221211113313221212   <<    C312312111111331312111133133313331333133313231333132212111133132212123   >>      C312312111111331312111133133313331333133313231333132212111133132212122   >>