वत्सांसाभ्यां कामबले

Operational rule vidhi

The affix लच् comes in the senses of 'love' and 'strength' respectively after the words वत्स and अंस.

Word by word (padaccheda)

Left context वत्स- अंसाभ्याम् pañcamī · dvivacanaRight context काम- बले saptamī · ekavacana

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

वत्स-अंसाभ्याम् काम-बले

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

Commentary

The affix लच् comes in the senses of 'love' and 'strength' respectively after the words वत्स and अंस।
Thus वत्सलः 'loving the calf, loving, tender'. अंसलः 'strong, lusty'. The word वत्स means 'calf'; in वत्सल there is no trace of its origin, for it is applied to father, master &c, as वत्सलः स्वामी, वत्सलः पिता &c. The word अंस means 'shoulder': but अंसल means 'strong'. The affix लच् in these cases is not optional, but necessary and debars मतुप् ॥ In other senses, the matup only is added as अंसवती गौः, अंसवान् दुर्बलः ॥

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