C11112331312111112111133133313331333133313223313331311331333133313133112121   >>    C1111233131211111211113313331333133313331322331333131133133313331313311212   <<    C11112331312111112111133133313331333133313223313331311331333133313133112123   >>      C11112331312111112111133133313331333133313223313331311331333133313133112122   >>