4.1.124
विकर्णकुषीतकात् काश्यपे
Operational rule vidhi
The affix ढक् comes after the words 1. विकर्ण and 2. कुषीत when they mean the descendants of काश्यप.
Word by word (padaccheda)
Left context विकर्ण- कुषीतकात् pañcamī · ekavacanaRight context काश्यपे saptamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
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Full reading
विकर्ण- कुषीतकात् काश्यपे
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ढक् comes after the words 1. विकर्ण and 2. कुषीत when they mean the descendants of काश्यप।
Thus वैकर्णेयः and कौषीतकेयः = काश्यपः; otherwise we have वैकर्णिः and कौषीतकिः formed by 4.1.95.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.