C11112331312111112111133133313331333133311222121111113313331323223313131   >>    C1111233131211111211113313331333133313331122212111111331333132322331313   <<    C11112331312111112111133133313331333133311222121111113313331323223313133   >>      C11112331312111112111133133313331333133311222121111113313331323223313132   >>