शुष्कचूर्णरूक्षेषु पिषः

Operational rule vidhi

The affix णमुल् comes after the verb पिष् 'to grind', when the words 1. शुष्क 'dry' 2. चूर्ण 'powder' 3. रूक्षे 'dry', in the Accusative -2nd case are compounded with it.

Word by word (padaccheda)

Right context शुष्क- चूर्ण- रूक्षेषु saptamī · bahuvacanaLeft context पिषः pañcamī · ekavacana

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").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

शुष्क-चूर्ण-रूक्षेषु पिषः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix णमुल् comes after the verb पिष् 'to grind', when the words 1. शुष्क 'dry' 2. चूर्ण 'powder' 3. रूक्षे 'dry', in the Accusative -2nd case are compounded with it.
Thus शुष्कपेषं पिनष्टि = शुष्कं पिनष्टि 'he grinds it dry'; चूर्णपेषं पिनष्टि 'he grinds to powder'; रूक्षपेषं पिनष्टि 'he grinds it dry'. Here also an appropriate verb from the same root पिष् must be used to govern the gerund.

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