C11111211113313112113313331333133313133313232233133112213123121   >>    C1111121111331311211331333133313331313331323223313311221312312   <<    C11111211113313112113313331333133313133313232233133112213123123   >>      C11111211113313112113313331333133313133313232233133112213123122   >>