C11111211113313112113313331333133313133313232233133313113313331333211221   >>    C1111121111331311211331333133313331313331323223313331311331333133321122   <<    C11111211113313112113313331333133313133313232233133313113313331333211223   >>      C11111211113313112113313331333133313133313232233133313113313331333211222   >>