tadyathā anityaḥ śabdaḥ kṛtakatvād ghaṭavad iti kṛte kaścid viruddhāvyabhicāriṇam āha nityaḥ śabdaḥ śrāvaṇatvācchabdatvavad iti
For example, when [someone] has stated "sound is non-eternal because it is produced, like a pot", someone might state an invariable concomitant of the opposite: "sound is eternal because it is audible, like soundness [itself]"