C31231211111133131211113313331333133313332233133313132233131221   >>    C3123121111113313121111331333133313331333223313331313223313122   <<    C31231211111133131211113313331333133313332233133313132233131223   >>      C31231211111133131211113313331333133313332233133313132233131222   >>