5.1.31
बिस्ताच्च
Operational rule vidhi
The आर्हीय affix (5.1.37)-63 occasioning a द्विगु compound, is optionally elided after the word बिस्त preceded by द्वि and त्रि.
Word by word (padaccheda)
Left context बिस्तात् pañcamī · ekavacanaIndeclinable च 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
बिस्तात् च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The आर्हीय affix 5.1.37-63 occasioning a द्विगु compound, is optionally elided after the word बिस्त preceded by द्वि and त्रि।
The word च in the sutra draws in the words द्वित्रिपूर्वात् ॥ Thus द्विबिस्तम् or द्विबैस्तिकम्, त्रिबिस्तम् or त्रिबैस्तिकम्, बहुबिस्तम्, बहुबैस्तिकम् ॥
The separation of this sutra is for the sake of the subsequent sutra.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.