C11112331312111112111133133313331333133313331333133313331211113313233213121   >>    C1111233131211111211113313331333133313331333133313331333121111331323321312   <<    C11112331312111112111133133313331333133313331333133313331211113313233213123   >>      C11112331312111112111133133313331333133313331333133313331211113313233213122   >>