C11112331312111112111133133313331333133313123313331323222233313111   >>    C1111233131211111211113313331333133313331312331333132322223331311   <<    C11112331312111112111133133313331333133313123313331323222233313113   >>      C11112331312111112111133133313331333133313123313331323222233313112   >>