C312312111133131212111133133313331333133312133313331333223313222221231   >>    C31231211113313121211113313331333133313331213331333133322331322222123   <<    C312312111133131212111133133313331333133312133313331333223313222221233   >>      C312312111133131212111133133313331333133312133313331333223313222221232   >>