成唯識論述記 1.421

1.421

自下第六，彼計三種體、相各別，仍說和合，共成一相，以彼三體，例成一相。

Below is the sixth [refutation]. They posit that the essences and characteristics of the three types are distinct, yet they still say that they combine to jointly establish a single characteristic; by analogy with those three essences, the single characteristic is challenged.