 Chengguan groups the remaining two dharma-realms together as dharma-realms of non-obstruction. The third, the dharma-realm of non-obstruction among shi and li, correlates with the second discernment from Dushun’s Discernments of the Dharmadhatu. The fourth, the dharma-realm of non-obstruction among shi and shi, correlates with the third discernment from Dushun’s Discernments of the Dharmadhatu. Chengguan endorses Dushun’s analysis of these realms. He adds, to Dushun’s insights, the claim that the non-obstruction of li and shi is the foundation for the non-obstruction among shi. His meaning is twofold. From a practical perspective, he means that meditative insight into li is a prerequisite for meditative insight into shi. From a theoretical perspective, he means that shi are mutually identical and inclusive by virtue of their common penetration by li: since each shi is identical with and includes li, and since li is identical with and includes all shi, each shi is identical with and includes all other shi. 