दुन्योरनुपसर्गे

Operational rule vidhi

The affix ण is used after the verbs दु 'to burn' and नी 'to lead', when used without a preposition.

Word by word (padaccheda)

Target दुन्योः ṣaṣṭhī · dvivacanaRight context अनुपसर्गे saptamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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दुन्योः अनुपसर्गे

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Commentary

The affix ण is used after the verbs दु 'to burn' and नी 'to lead', when used without a preposition.
Thus दु + ण = दौ + अ 7.2.115 = दावः 6.1.78 'burning'. So also नी + ण = नी + अ = नायः 'leading'.

Why do we say 'when used without a preposition'? Observe प्रदयः 'burning'; प्रणयः 'friendship'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.