C11112331312111112111133133313331333133313223223313121111133112233121   >>    C1111233131211111211113313331333133313331322322331312111113311223312   <<    C11112331312111112111133133313331333133313223223313121111133112233123   >>      C11112331312111112111133133313331333133313223223313121111133112233122   >>