C312312111111331312111133133313331333133313232233133313331333133313232312131   >>    C31231211111133131211113313331333133313331323223313331333133313331323231213   <<    C312312111111331312111133133313331333133313232233133313331333133313232312133   >>      C312312111111331312111133133313331333133313232233133313331333133313232312132   >>