tathā hi ubhayamapyetat kiñcit svataḥ kiñciparata iti pūrvamupavarṇitam / ata eva pakṣacatuṣṭayopanyāso 'pyayuktaḥ /
For it has been explained before that both [validity and invalidity] are sometimes intrinsic and sometimes extrinsic. Therefore even the presentation of [only] four positions is incorrect.