पदान्तस्यान्यतरस्याम्

Operational rule vidhi

The sūtra द्वारादीनां च (7.3.4) is optionally applied to श्वन् followed by पद.

Word by word (padaccheda)

Target पदान्तस्य ṣaṣṭhī · ekavacanaRight context अन्यतरस्याम् saptamī · ekavacana

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

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

पदान्तस्य अन्यतरस्याम्

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

The sūtra द्वारादीनां च 7.3.4 is optionally applied to श्वन् followed by पद।
As श्वापदस्येदं = श्वापदम् or शौवापदम् ॥

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