唯識二十論述記 2.101

2.101

述曰：前破無分不得相礙，今破不礙，令處應同。此極微處應即是諸極微處所，不相礙故。既爾，此色應不成麁，皆相入故。

Commentary: Previously it was refuted that lacking parts would mean they cannot obstruct each other; now it is refuted that if they do not obstruct each other, their locations should be identical. The location of this paramāṇu should be precisely the location of all the paramāṇus, because they do not obstruct each other. If so, this form could not become coarse, because they would all interpenetrate.