  (iii) The Naiyāyikas offer the following account (TSD 66c) of language acquisition. The child makes a series of observations concerning the linguistic behaviour of adults. She hears adult A utter a certain noise “Bring the cow” say, and sees adult B perform a certain action, bringing of the cow. Again, she hears A utter the noise “Bring the horse”, and sees B bring the horse, and hears “Feed the cow” and sees the cow being fed. Then, by a twin inductive process, of (a) “agreement in presence” (anvaya) and “agreement in absence” (vyatireka)—i.e. noticing the correlation between A making or not making an utterance and B performing or not performing an action, and (b) ‘collection’ (āvāpa) and ‘rejection (udvāpa)—i.e. noticing the regularities between utterances of “cow” and events concerning the cow, utterances of “bring” and bringing events, etc., the child understands that the word “cow” is linked with objects belonging the class of cows, etc.