4.2.126
कच्छाग्निवक्त्रवर्त्तोत्तरपदात्
Operational rule vidhi
The affix वुञ् comes in the remaining senses after a word whether a वृद्ध or not, denoting a locality and having its second term the words 1. कच्छ 2. अग्नि 3. वक्त्र and 4. गर्त.
Word by word (padaccheda)
Left context कच्छ- अग्नि- वक्त्र- वर्त- उत्तरपदात् pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
कच्छ-
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 word whether a वृद्ध or not, denoting a locality and having its second term the words 1. कच्छ 2. अग्नि 3. वक्त्र and 4. गर्त।
This debars छ and अण् ॥ As दारुकच्छकः, पैप्पलीकच्छकः, काण्डाग्नकः, वैभुजाग्नकः ऐन्द्रवक्त्रकः, सैन्धुवक्त्रकः, बाहुगर्तकः and चाक्रगर्तकः ॥
The word उत्तरपद in the sutra should be read with every one of the words कच्छ &c.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.