C11112331312111112111133133313331333133313223223313113313223312121   >>    C1111233131211111211113313331333133313331322322331311331322331212   <<    C11112331312111112111133133313331333133313223223313113313223312123   >>      C11112331312111112111133133313331333133313223223313113313223312122   >>