वस्नद्रव्याभ्यां ठन्कनौ

Operational rule vidhi

The affix ठन् (-/- -इक्) and कन् (-/- क) come respectively after the words वसन and द्रव्य , in the 2nd case in construction, in the same sense of 'who carries etc.'.

Word by word (padaccheda)

Left context वस्न- द्रव्याभ्याम् pañcamī · dvivacanaSubstitute / term ठन्कनौ prathamā · dvivacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

वस्न-द्रव्याभ्याम् ठन्कनौ

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

Commentary

The affix ठन् (-/- -इक्) and कन् (-/- क) come respectively after the words वसन and द्रव्य , in the 2nd case in construction, in the same sense of 'who carries etc.'.
Thus वस्नं हरति वहति वा = वस्निकः, द्रव्यकः ॥

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