C11112331312111112111133133313331333132323133313331333233112121   >>    C1111233131211111211113313331333133313232313331333133323311212   <<    C11112331312111112111133133313331333132323133313331333233112123   >>      C11112331312111112111133133313331333132323133313331333233112122   >>