द्वित्रिपूर्वादण् च

Operational rule vidhi

The affix अण् (-/- -अ) as well as यत् optionally also comes after the word शाण , in the आर्हीय-senses (5.1.37)-63, when preceded by the words द्वि and त्रि.

Word by word (padaccheda)

Left context द्वित्रिपूर्वात् pañcamī · ekavacanaSubstitute / term अ prathamā · 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.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

Dotted words are technical terms. Hover or tap one to see its card.

Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.

Full reading

द्वित्रिपूर्वात् अण् च

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

Commentary

The affix अण् (-/- -अ) as well as यत् optionally also comes after the word शाण , in the आर्हीय-senses 5.1.37-63, when preceded by the words द्वि and त्रि।
The यत् comes optionally by the last sutra and is also drawn into this by the word च. Thus we have three forms, द्विशाण्यम्, द्वैशाणम्, and द्विशाणम्, so also त्रिशाण्यम्, त्रैशाणम् and त्रिशाणम् ॥
5.1.37.md''
The irregular Vriddhi of the second term in cases of compounds of numerals, taught in 7.3.15 - 7.3.17, does not however take place in the case of शाण, this word being especially excluded from the operation of those rules, see 7.3.17. The Vriddhi here is regular as taught by the general rule 7.2.117.

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