C11112331312111112111133133313331333132322121111331311223112121   >>    C1111233131211111211113313331333133313232212111133131122311212   <<    C11112331312111112111133133313331333132322121111331311223112123   >>      C11112331312111112111133133313331333132322121111331311223112122   >>