C1111233133313231133133313331333133311221123121111133313113313123231211   >>    C111123313331323113313331333133313331122112312111113331311331312323121   <<    C1111233133313231133133313331333133311221123121111133313113313123231213   >>      C1111233133313231133133313331333133311221123121111133313113313123231212   >>