C11112331312111112111133133313331333132323213331333133313232121   >>    C1111233131211111211113313331333133313232321333133313331323212   <<    C11112331312111112111133133313331333132323213331333133313232123   >>      C11112331312111112111133133313331333132323213331333133313232122   >>