C11112331312111112111133133313331333133313331333133313331333131122233312121   >>    C1111233131211111211113313331333133313331333133313331333133313112223331212   <<    C11112331312111112111133133313331333133313331333133313331333131122233312123   >>      C11112331312111112111133133313331333133313331333133313331333131122233312122   >>