C11111333133313232233133313331333133112111112113313231333212121   >>    C1111133313331323223313331333133313311211111211331323133321212   <<    C11111333133313232233133313331333133112111112113313231333212123   >>      C11111333133313232233133313331333133112111112113313231333212122   >>