C11112331312111112111133133313331333133313123313331333223313211   >>    C1111233131211111211113313331333133313331312331333133322331321   <<    C11112331312111112111133133313331333133313123313331333223313213   >>      C11112331312111112111133133313331333133313123313331333223313212   >>