C11111333133313232233133313331333133112323131121211113313123121   >>    C1111133313331323223313331333133313311232313112121111331312312   <<    C11111333133313232233133313331333133112323131121211113313123123   >>      C11111333133313232233133313331333133112323131121211113313123122   >>