जॄव्रश्च्योः क्त्वि

Operational rule vidhi

The affix क्त्वा gets the इट् augment after जॄ and जॄव्रश्च्.

Word by word (padaccheda)

Target जॄव्रश्च्योः ṣaṣṭhī · dvivacanaRight context क्त्वि saptamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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

जॄव्रश्च्योः क्त्वि

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

Commentary

The affix क्त्वा gets the इट् augment after जॄ and जॄव्रश्च्।
As जरित्वा or जरीत्वा, 7.2.38 and व्रश्चित्वा ॥ जॄ was prohibited by 7.2.11. and व्रश्च would have been optionally सेट्, as it has an indicatory long ऊ, by 7.2.44. Hence this rule. The special mention of ktva, stops the anuvritti of kta and ktavatu.

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