C11112331312111112111133133313331333133313223223313121111121331123121   >>    C1111233131211111211113313331333133313331322322331312111112133112312   <<    C11112331312111112111133133313331333133313223223313121111121331123123   >>      C11112331312111112111133133313331333133313223223313121111121331123122   >>