Sūtra 7·1·80
आच्छीनद्योर् नुम्
ācchīnadyor num
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When the affix śat comes after a verbal stem ending in a or ā, it may optionally take the augment num, before the neutral case-ending śī and before the feminine affix ī
Padapāṭha ātśīnadyoḥ numआत्शीनद्योः नुम्