C11112331312111112111133133313331333133313123313331312111113331333132222233121   >>    C1111233131211111211113313331333133313331312331333131211111333133313222223312   <<    C11112331312111112111133133313331333133313123313331312111113331333132222233123   >>      C11112331312111112111133133313331333133313123313331312111113331333132222233122   >>