2.4.50 विभाषा लुङ्लृङोः

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context लुङ्- लृङोः 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

लुङ्-लृङोः

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

Commentary

गाङ् is optionally the substitute of इङ् when लुङ् (Aorist) and ऌङ् (Conditional Future) follow.
Let us take the case when गाङ् replaces इङ्. The affixes of लुङ् and लृङ् are treated as ङित् by 1.2.1. and then by the Rule 6.4.66 (When an ardhadhatuka affix, beginning with a consonant and distinguished by an indicatory क or ङ् follows; then let ई be the substitute of long आ of the verbs termed घु and of मा, स्था, गा पा, हा, सी), we get अध्यगीष्ट (अधि + अ + गी + स्त), अध्यगीषाताम्, अध्यगीषत. In the alternative we have अध्यैष्ट, अध्यैषाताम् and अध्यैषत.

So also in लृङ्; as अध्यगीष्यत, अध्यगीष्येताम्, अध्यगीष्यन्त, or in the alternative, अध्यैष्यत,आध्यैष्येताम् and अध्यैष्यन्त.

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