5.1.35
शाणाद्वा
Operational rule vidhi
The affix यत् comes optionally after the word शन, in the आर्हीय-senses (5.1.63), when it is preceded by the word अध्यर्ध or a Numeral occasioning a द्विगु.
Word by word (padaccheda)
Left context शाणात् pañcamī · ekavacanaIndeclinable वा avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
शाणात् वा
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix यत् comes optionally after the word शन, in the आर्हीय-senses 5.1.63, when it is preceded by the word अध्यर्ध or a Numeral occasioning a द्विगु।
This debars ठञ् which also comes in the alternative, and is then elided by 5.1.28. Thus अध्यर्द्धशाण्यम् or अध्यर्द्धशाणम्, द्विशाण्यम् or द्विशाणम्, त्रिशाण्यम् or त्रिशाणम् ॥
Vart:- So also optionally after the word शत, as, अध्यर्द्धशत्यम् or शतम्, द्विशत्यम् or शतम्, त्रिशत्यम् or शतम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.