सिचि च परस्मैपदेषु

Operational rule vidhi

The इट् is not lengthened after वॄ , वृञ् and after roots ending in long ॠ in the s-Aorist of the परस्मैपद .

Word by word (padaccheda)

Right context सिचि saptamī · ekavacanaIndeclinable च avyayaRight context saptamī · bahuvacana

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

सिचि च

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

Commentary

The इट् is not lengthened after वॄ , वृञ् and after roots ending in long ॠ in the s-Aorist of the परस्मैपद ।
As प्रावारिष्टाम्, प्रावारिषुः, अतारिष्टाम्, from तॄ प्लवनतरणयोः ॥ आस्तारिष्टाम्, आस्तारिषुः, from स्तृञ् आच्छादने; but प्रावरिष्ट, प्रावरीष्ट in the Atmanepada.

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