The Art of War by active 6th century B.C. Sunzi

16. On the other hand, it is noteworthy that _Wu Tzŭ_, which is not in

6 chapters, has 48 assigned to it in the _Han Chih_. Likewise, the _Chung Yung_ is credited with 49 chapters, though now only in one only. In the case of very short works, one is tempted to think that _p’ien_ might simply mean "leaves."