C11111333133313232233133313331333133112111112113313231311312121   >>    C1111133313331323223313331333133313311211111211331323131131212   <<    C11111333133313232233133313331333133112111112113313231311312123   >>      C11111333133313232233133313331333133112111112113313231311312122   >>