प्रयोज्यनियोज्यौ शक्यार्थे

Operational rule vidhi

प्रयोज्य and नियोज्य preserve their palatal in the sense of 'capable to do this'.

Word by word (padaccheda)

Substitute / term प्रयोज्यनियोज्यौ prathamā · dvivacanaRight context शक्यार्थे saptamī · ekavacana

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

प्रयोज्यनियोज्यौ शक्यार्थे

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

Commentary

प्रयोज्य and नियोज्य preserve their palatal in the sense of 'capable to do this'.
As प्रयोज्यः = प्रयोक्तुं शक्यः, नियोज्यः = नियोक्तुं शक्यः, but प्रयोग्य and नियोग्य in other senses.

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