विभाषा तृन्नन्नतीक्ष्णशुचिषु

Operational rule vidhi

After the negative particle, the final of the following is optionally acute accent (उदात्त) - a word formed with the affix तृन् and the words 1. अन्न 2. तीक्ष्ण and 3. शुचि.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context तृन्- अन्न- तीक्ष्ण- शुचिषु saptamī · bahuvacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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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Full reading

तृन्-अन्न-तीक्ष्ण-शुचिषु

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

Commentary

After the negative particle, the final of the following is optionally acute accent (उदात्त) - a word formed with the affix तृन् and the words 1. अन्न 2. तीक्ष्ण and 3. शुचि।
Thus तृन् - अकर्त्ता꣡ or अ꣡कर्त्ता; अन्न &c - अनन्न꣡म् or अ꣡नन्नम्, अतीक्ष्ण꣡म्, or अ꣡तीक्ष्णम्, अशुचिः꣡ or अ꣡शुचिः ॥ The alternative accent is that of the Indeclinable. 6.2.2

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