हलसूकरयोः पुवः

Operational rule vidhi

The affix ष्ट्रन् is used after the verb पू 'to purify' with the sense of instrument when denoting a member of the body of a plough or of a hog.

Word by word (padaccheda)

Right context हल- सूकरयोः saptamī · dvivacanaLeft context पुवः 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

हल-सूकरयोः पुवः

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

Commentary

The affix ष्ट्रन् is used after the verb पू 'to purify' with the sense of instrument when denoting a member of the body of a plough or of a hog.
The verb पू includes both पूङ् and पूञ् as पोत्रम् 'a plough-share'; पोत्रमे 'the snout of a hog'.

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