गिरेश्च सेनकस्य

Operational rule vidhi

The affix टच् comes after an अव्ययीभाव समास ending in गिरि according to the opinion of the Grammarian सेनक.

Word by word (padaccheda)

Left context गिरेः pañcamī · ekavacanaIndeclinable च avyayaTarget सेनकस्य ṣaṣṭhī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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Full reading

गिरेः च सेनकस्य

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

Commentary

The affix टच् comes after an अव्ययीभाव समास ending in गिरि according to the opinion of the Grammarian सेनक।
Thus अन्तर्गिरम् or अन्तर्गिरि, उपगिरम् or उपगिरि ॥ The name of Senaka is mentioned for the sake of respect (pujartha), for the anuvritti of the word अन्यतरस्याम् "optionally" was understood here already.

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