瑜伽論記 18.170

18.170

又於不共大種聚中至無有一處不相離諸大種色者，此中須知不共大種及非不共大種者，唯辨大種不論造色，不共大種聚中，且如木石聚中唯一地大，實無此事。設當唯有一微起，即非三種不相離攝，若有二微已上多微雜住，即是相離不相離，以二地大不相容受故，無同處不相離義，二微地大並時微密難分，不同穀豆等聚，故非和合不相離攝。

Where it says, "Furthermore, within an aggregate of non-common primary elements... there is no co-locational non-separation of the various primary element forms," here one must know that 'non-common primary elements' and 'non-non-common primary elements' are spoken of purely to distinguish the primary elements, without discussing derived form. In an aggregate of non-common primary elements—such as in an aggregate of wood and stone where there is solely the earth element—such a thing does not actually exist. Even if there were to arise only a single subtle atom, it would not be subsumed under the three kinds of non-separation. If there are two or more subtle atoms co-residing mixed together, it is 'separated non-separation' (viyukta-avinirbhāga), because two earth elements cannot contain each other, so there is no sense of co-locational non-separation; [yet] two subtle atoms of the earth element are simultaneously microscopic and difficult to distinguish, unlike a heap of grain, beans, and the like, so it is not subsumed under 'composite non-separation'.