C31231211113313121211113313331333133313331213331333131133232212121   >>    C3123121111331312121111331333133313331333121333133313113323221212   <<    C31231211113313121211113313331333133313331213331333131133232212123   >>      C31231211113313121211113313331333133313331213331333131133232212122   >>