C11112331312111112111133133313331333133313112113313331333133313113313223313211   >>    C1111233131211111211113313331333133313331311211331333133313331311331322331321   <<    C11112331312111112111133133313331333133313112113313331333133313113313223313213   >>      C11112331312111112111133133313331333133313112113313331333133313113313223313212   >>