4.2.123
रोपधेतोः प्राचाम्
Operational rule vidhi
The affix वुञ् comes in the remaining senses after a वृद्ध word denoting a locality of the East-folk, the word having penultimate र or ending in ई.
Word by word (padaccheda)
Target र- - ṣaṣṭhī · dvivacanaTarget प्राचाम् ṣaṣṭhī · bahuvacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
र-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix वुञ् comes in the remaining senses after a वृद्ध word denoting a locality of the East-folk, the word having penultimate र or ending in ई।
This debars छ ॥ Thus पाटलिपुत्रकाः, ऐकचक्रकाः ॥ So also with words ending in ई ॥ As, काकन्दी — काकन्दकः, माकन्दी — माकन्दकः 6.4.148.
Why do we say प्राचाम् 'of the East-folk'? Observe दात्तामित्रीयः formed by छ. The त् in ईत् in the sutra is for the sake of distinctness.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.