ये विभाषा

Operational rule vidhi

There is optionally the substitution of long आ for the finals of जन् , सन् and खन् before the affix beginning with य and marked with an indicatory क् or ङ्.

Word by word (padaccheda)

Right context ये saptamī · ekavacanaSubstitute / term prathamā · 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").
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

ये

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

Commentary

There is optionally the substitution of long आ for the finals of जन् , सन् and खन् before the affix beginning with य and marked with an indicatory क् or ङ्।
Thus जायते or जन्यते (with यक्) जाजायते or जज्जन्यते (with यङ्) । So also सायते or सन्यते, सासायते, or संसन्यते, खायते, or खन्यते, चाखायते or चङ्खन्यते ॥ Before the vikarana श्यन् of the Fourth class, which is ङित् according to (l. 2.4); the जा is always substituted for जन् by 7.3.79. No option is allowed there.

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