समायाः खः

Operational rule vidhi

The affix ख (ईन) comes in the four-fold senses of 'solicited', 'hired', 'lasted' and 'will last', after the word समा.

Word by word (padaccheda)

Left context समायाः pañcamī · ekavacanaSubstitute / term खः 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

समायाः खः

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

Commentary

The affix ख (ईन) comes in the four-fold senses of 'solicited', 'hired', 'lasted' and 'will last', after the word समा।
This debars ठञ् ॥ Thus समामधीष्टो, भृतो भूतो भावी वा = समीनः ॥ Some say, the sense of the affix is तेन निर्वृत्तम् 5.1.79, as समया निर्वृत्तः = समीनः ॥

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