संयोगादिश्च

Operational rule vidhi

The syllable इन् of a अङ्ग (stem) ending in इन् remains unchanged before अण् when a conjunct consonant precedes it.

Word by word (padaccheda)

Substitute / term संयोगादिः prathamā · ekavacanaIndeclinable च avyaya

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".

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Full reading

संयोगादिः च

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

Commentary

The syllable इन् of a अङ्ग (stem) ending in इन् remains unchanged before अण् when a conjunct consonant precedes it.
Thus शाङ्किनेऽपत्यं = शाङ्किनः, याद्रिणः, वाज्जिणः ॥

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