6.1.29
लिड्यङोश्च
Operational rule vidhi
There is substitution of पी for प्याय् when the affixes of the Perfect (लिट्) and the Intensive (यङ्) follow.
Word by word (padaccheda)
Right context लिट्- यङोः saptamī · dvivacanaIndeclinable च avyaya
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
लिट्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
There is substitution of पी for प्याय् when the affixes of the Perfect (लिट्) and the Intensive (यङ्) follow.
The anuvritti of the word विभाषा ceases. The phrase प्यायः पी of the last sutra is drawn into this by force of the word च 'and'; thus आपिप्ये, आपिप्याते, आपिप्यिरे ॥
The substitution of पी a subsequent rule, would have debarred reduplication which precedes it in order. The reduplication, however, takes place after the substitution, by force of the maxim of पुनः प्रसङ्ग &c mentioned in 6.1.17. Thus पी + लिट् = पि + पी + त = पि + प्य + ए 6.4.82 the य being substituted) = आपिप्ये with the affix आ. So also in the Intensive, as, आपेपीयते, आपेपीयेते, आपेपीयन्ते ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.