C312312111133131212111133133313331333133312133313331333121111123313223111   >>    C31231211113313121211113313331333133313331213331333133312111112331322311   <<    C312312111133131212111133133313331333133312133313331333121111123313223113   >>      C312312111133131212111133133313331333133312133313331333121111123313223112   >>