Sūtra 7·3·44
प्रत्ययस्थात् कात् पूर्वस्य अत इद् आप्य् असुपः
pratyayasthāt kāt pūrvasya ata id āpy asupaḥ
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i is substituted for the a which stands before the k belonging to an affix, when the Feminine-ending ā follows, provided that, it does not come after a case-afûix (i.e. when such a word in aka does not stand at the end of a Bahuvrûhi).
Padapāṭha pratyayasthāt kāt pūrvasya ataḥ it āpi asupaḥप्रत्ययस्थात् कात् पूर्वस्य अतः इत् आपि असुपः