C11112331312111112111133133313331333133311222121111132233312121   >>    C1111233131211111211113313331333133313331122212111113223331212   <<    C11112331312111112111133133313331333133311222121111132233312123   >>      C11112331312111112111133133313331333133311222121111132233312122   >>