C1111233131211111211113313331333133313311211111333133313331333133313123121231   >>    C111123313121111121111331333133313331331121111133313331333133313331312312123   <<    C1111233131211111211113313331333133313311211111333133313331333133313123121233   >>      C1111233131211111211113313331333133313311211111333133313331333133313123121232   >>