कद्रुकमण्डल्वोश्छन्दसि

Operational rule vidhi

The feminine affix ऊङ् comes in the छन्दस् (Vedas) after the words 1. कद्रु 'tawny' 2. कमण्डलु 'a water pot'.

Word by word (padaccheda)

Target कद्रु- कमण्डल्वोः ṣaṣṭhī · dvivacanaRight context छन्दसि 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

कद्रु-कमण्डल्वोः छन्दसि

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

Commentary

The feminine affix ऊङ् comes in the छन्दस् (Vedas) after the words 1. कद्रु 'tawny' 2. कमण्डलु 'a water pot'.
Thus कद्रुश्चवै सुपर्णी च ॥ मास्मकमण्डलूं शूद्राय दद्यात् ॥

Why do we say "in the Vedas." Witness कद्रुः and कमण्डलुः ॥

Vart:- So also after the words गुग्गुलु, मधु, जतु and पतयालुः ॥ Thus गुग्गुलूः, मधूः, जतूः, and पतयालूः ॥

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