अस्मायामेधास्रजो विनिः

Operational rule vidhi

After a stem ending in अस् and after माया , मेधा and स्रज् comes the affix विनि in the sense of मतुप्.

Word by word (padaccheda)

Left context अस्- माया- मेधा- स्रजः pañcamī · ekavacanaSubstitute / term विनिः prathamā · ekavacana

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.

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Full reading

अस्-माया-मेधा-स्रजः विनिः

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

Commentary

After a stem ending in अस् and after माया , मेधा and स्रज् comes the affix विनि in the sense of मतुप्।
Thus पयस्-पयस्विन्, यशस्-यशस्विन् ॥ मायाविन्, मेधाविन्, स्रग्विन् ॥ The word माया being included in व्रीह्यादि class, will take इनि, and ठञ् also 5.2.116. As मायी, मायिकः ॥

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