पथिमथोः सर्वनामस्थाने

Operational rule vidhi

The acute accent is on the first syllable of पथिन् and मथिन् when followed by a strong case-ending.

Word by word (padaccheda)

Target पथि- मथोः ṣaṣṭhī · dvivacanaRight context 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").

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Full reading

पथि-मथोः

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

Commentary

The acute accent is on the first syllable of पथिन् and मथिन् when followed by a strong case-ending.
The words पथिन् and मथिन् are derived by the Unadi affix इनि, (IV. 12. and 13) and are oxytone by 3.1.3. They become adyudatta before strong cases. Thus प꣡न्थाः, प꣡न्थानौ, प꣡न्थानः, म꣡न्थाः, म꣡न्थानौ, म꣡न्थानः ॥ Before other cases we have:- पथः꣡ पश्य, मथः꣡ पश्य ॥ The accent is on the final by 6.1.162, there being elision of the udatta इन् ॥ The rule 1.1.62, about the remaining effect of the affix, does not apply here. As पथि꣡प्रियः, has acute on the final of the first word, by retaining its original accent.

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