"The System is Based upon Nothingness" in Zhuang Zi

In the Chapter of Tian xia(Universe) of Zhuang Zi,there is a sentence Jian zhi yi chang wu you. But there is no precise explanation for the phrasechang wu you. This paper thinks chang常wu youshould be written as heng恒wu you.And according to the Chu Bamboo Slips,in which the charactergen 亙can be used as ji 亟, it holds that in the original edition of Zhuang Zi the three characters might probably have been gen亙wu you.Genwas read as ji极, but was later misread as heng.