C11112331312111112111133133313331333133313331333112211231212131   >>    C1111233131211111211113313331333133313331333133311221123121213   <<    C11112331312111112111133133313331333133313331333112211231212133   >>      C11112331312111112111133133313331333133313331333112211231212132   >>