सन्लिटोर्जेः

Operational rule vidhi

ज् in जि 'to conquer' after a reduplication before the Desiderative affix सन् and in the लिट् (Perfect Tense).

Word by word (padaccheda)

Right context सन्लिटोः saptamī · dvivacanaTarget जेः ṣaṣṭhī · ekavacana

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").
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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Full reading

सन्लिटोः जेः

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

Commentary

ज् in जि 'to conquer' after a reduplication before the Desiderative affix सन् and in the लिट् (Perfect Tense).
As जिगीषति, जिगाय ॥ Why in the Desiderative and Perfect only? Observe जेजीयते ॥ Though the root ज्या also assumes the form जि by vocalisation 6.1.16, 6.1.17 yet that जि is not to be taken here. That will form जिज्यतुः, जिज्युः ॥

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