विभाषा कदाकर्ह्योः

Operational rule vidhi

The affix लट् (Present Tense) is optionally used after a root with the force of the futurity when it has in construction with it the adverbs कदा and कर्हि.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context कदा- कर्ह्योः saptamī · dvivacana

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

कदा-कर्ह्योः

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

Commentary

The affix लट् (Present Tense) is optionally used after a root with the force of the futurity when it has in construction with it the adverbs कदा and कर्हि।
As कदा भुङ्क्ते 'when will he eat', or कदा भोक्ष्यते or भोक्ता; so also कर्हिभुङ्क्ते or भोक्ष्यते or भोक्ता 'when will he eat'.

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