C11112331312111112111133133313331333133313223223313121111133112312121   >>    C1111233131211111211113313331333133313331322322331312111113311231212   <<    C11112331312111112111133133313331333133313223223313121111133112312123   >>      C11112331312111112111133133313331333133313223223313121111133112312122   >>