 The "Ancient Text" gives prominence not only to the three main subjects of the "Cantong qi", but also to the three authors traditionally considered to be involved in its composition.This is likely to be the main reason why several commentators, for whom Wei Boyang could only be the single author of the whole "Cantong qi", and Internal Alchemy its single subject, rejected the "Ancient Text" altogether.According to the new version, Wei Boyang wrote the portion entitled "Canon" ("Jing") in verses of 4 characters; Xu Congshi—whom the "Ancient Text" exegetes regularly identify as Xu Jingxiu 徐景休, as also did Yu Yan—contributed a "Commentary" ("Zhu" 注) in verses of 5 characters; and Chunyu Shutong added a final section, entitled "The Three Categories" ("San xianglei" 三相類).