成唯識論述記 3.224

3.224

The Commentary states: In explaining the four parts, from here down is the fourth section, explaining the establishment of a single part: first it subsumes them by meaning, next it cites a verse for confirmation, and finally it indicates analogies in general. As in the verse of the Pramāṇasamuccaya, they may be subsumed into three, because the entity of the result is one, so the four are subsumed into three.