C31231211111133131211113313331333133313331132323133313232212121   >>    C3123121111113313121111331333133313331333113232313331323221212   <<    C31231211111133131211113313331333133313331132323133313232212123   >>      C31231211111133131211113313331333133313331132323133313232212122   >>