成唯識論述記 3.279

3.279

述曰：不共中共，名共相種，由受用他故變他身，即前不共今名為共。此即最初總說本識於他亦變，不論根、境於中差別。

The Commentary states: The common within the uncommon is called "common-mark seeds." Because of enjoying another, one manifests another's body; thus what was previously uncommon is now called common. This is initially a general statement that the fundamental consciousness also manifests with respect to others, without distinguishing between indriyas and sense objects therein.