tatputraś ca bhaviṣyati na ca śyāma iti nātra kaścid virodha iti saṃdigdhavipakṣavyāvṛttikatvān nāyaṃ trilakṣaṇa ityasiddho dṛṣṭāntaḥ //
Since there is no contradiction in [someone] being that person's son but not being dark, due to having doubtful exclusion from the counter-example, this [reason] does not have three characteristics - thus the example is not established.