विभाषा चिण्णमुलोः

Operational rule vidhi

The verb root लभ् (when used without any उपसर्ग) optionally gets a नुमागम in presence of चिण्-प्रत्यय and णमुल्-प्रत्यय.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context चित्- णमुलोः saptamī · dvivacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

चित्-णमुलोः

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

Commentary

The augment नुम् is optionally added to लभ् 'to get' not preceded by a Preposition before the चिण् Aorist and the Absolutive णमुल्।
Thus अलाभि or अलम्भि, लाभंलाभम् or लम्भंलम्भम् ॥ This is a Vyavasthita-vibhasha, the option is allowed where there is no Preposition along with the root; and no option is allowed but नुम् must be added, when a Preposition precedes: as प्रालम्भि, प्रलम्भम् ॥

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