आवट्याच्च

Operational rule vidhi

And the feminine affix चाप् comes after the word आवट्य.

Word by word (padaccheda)

Left context आवट्यात् pañcamī · ekavacanaIndeclinable च avyaya

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

आवट्यात् च

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

Commentary

And the feminine affix चाप् comes after the word आवट्य।
The word अवट belongs to Gargadi class 4.1.105 which after taking यञ्, would have taken ङीप् 4.1.16. Thus आवट्या 'a female descendant of Avata'. But आवट्यायनी will be the proper form according to the Eastern Grammarians. See aphorism 4.1.17.

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