योगाद्यच्च

Operational rule vidhi

The affix यत् (यं) is also added in the sense of 'able to effect that' after the word योग.

Word by word (padaccheda)

Left context योगात् pañcamī · ekavacanaSubstitute / term य prathamā · 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.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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योगात् यत् च

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

The affix यत् (यं) is also added in the sense of 'able to effect that' after the word योग।
Thus योगाय प्रभवति = योग्यः or यौगिकः ॥

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