C312312111133131212111133133313231333133313331331123313231322312121   >>    C31231211113313121211113313331323133313331333133112331323132231212   <<    C312312111133131212111133133313231333133313331331123313231322312123   >>      C312312111133131212111133133313231333133313331331123313231322312122   >>