प्रतिजनादिभ्यः खञ्

Operational rule vidhi

The affix खञ् comes in the sense of 'excellent in regard thereto' after the words प्रतिजन etc.

Word by word (padaccheda)

Left context प्रतिजन- आदिभ्यः pañcamī · bahuvacanaSubstitute / term 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

प्रतिजन-आदिभ्यः खञ्

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

Commentary

The affix खञ् comes in the sense of 'excellent in regard thereto' after the words प्रतिजन etc.
This debars यत् ॥ Thus प्रतिजने साधुः = प्रातिजनीनः 7.1.2 'suitable against an adversary', or 'who is excellent for every person'. So also एवं युगीनः, सांयुगीनः ॥

1 प्रतिजन, 2 इदंयुग, 3 संयुग, 4 समयुग, 5 परयुग, 6 परकुल, 7 परस्यकुल, 8 अमुष्यकुल, 9 सर्वजन, 10 विश्वजन, 11 महाजन, 12 पञ्चजन. ॥

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