कर्मणो रोमन्थतपोभ्यां वर्तिचरोः

Operational rule vidhi

The affix क्यङ् is used after the words रोमन्य 'ruminating' and तपस 'austerity', when they are used as the objects of the action of repeating and performing respectively.

Word by word (padaccheda)

Left context कर्मणः pañcamī · ekavacanaLeft context रोमन्थ- तपोभ्याम् pañcamī · dvivacanaRight context वर्त्तिचरोः saptamī · dvivacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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

कर्मणः रोमन्थ-तपोभ्याम् वर्त्तिचरोः

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

Commentary

The affix क्यङ् is used after the words रोमन्य 'ruminating' and तपस 'austerity', when they are used as the objects of the action of repeating and performing respectively.
Thus, रोमन्थं वर्तयति = रोमन्थायते गौः 'the cow ruminates'.

Vart: This is restricted to the word signifying movements of the jaws. Therefore there is no affixing here; as, कीटो रोमन्थं वर्तयति.

Vart:The Parasmaipada affixes are used after the word तपस्; as तपश्चरति = तपस्यति, 'he performs austerity'.

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