yatra dvairāśyaṃ bhavati tadetarapratiṣedhāditaratpratīyate yathā gaur itipade gauḥ pratīyamāno 'gaur niṣedhyamānaḥ /
Where there is a dichotomy, one thing is understood through the negation of its opposite, as in the case of the word 'go', where 'cow' is understood [and] 'non-cow' is negated.