C31231211113313121211113313331333133313311211331333133313232232221   >>    C3123121111331312121111331333133313331331121133133313331323223222   <<    C31231211113313121211113313331333133313311211331333133313232232223   >>      C31231211113313121211113313331333133313311211331333133313232232222   >>