C31231211113313112133313331311331333133313331333133313311212221   >>    C3123121111331311213331333131133133313331333133313331331121222   <<    C31231211113313112133313331311331333133313331333133313311212223   >>      C31231211113313112133313331311331333133313331333133313311212222   >>