समि युद्रुदुवः

Operational rule vidhi

The affix घञ् comes after the roots 1. यु 'to join' 2. द्रु 'to run' 3. दु 'to burn' when in composition with the preposition सम्.

Word by word (padaccheda)

Right context समि saptamī · ekavacanaLeft context यु- द्रु- दुवः pañcamī · 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").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

समि यु-द्रु-दुवः

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

Commentary

The affix घञ् comes after the roots 1. यु 'to join' 2. द्रु 'to run' 3. दु 'to burn' when in composition with the preposition सम्।
As संयावः, सन्द्रावः, सन्दावः । But प्रयवः where the preposition is not sam.

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