Pāṇini sūtras

Before a Taddhita affix having an indicatory ñ, ṇ or ka, in a Dvandva compound of god-names, the vṛiddhi is not substituted for the first vowel of varuṇa when a long vowel precedes it.

1. dīrghātदीर्घात्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	dīrghaदीर्घ	dīrghātदीर्घात्	long	dīrghदीर्घ् + plus ātआत्

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

3. varuṇasyaवरुणस्य

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	varuṇaवरुण	varuṇasyaवरुणस्य	varuṇa [word]वरुण [wओर्द्]	varuṇवरुण् + plus asyaअस्य

Anuvṛtti

1. uttara+padasyaउत्तर+पदस्य 7·3·10

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	uttaraउत्तर	uttaraउत्तर	following	uttarउत्तर् + plus aअ
   pप्	padaपद	padasyaपदस्य	word	padपद् + plus asyaअस्य

2. na+indrasyaन+इन्द्रस्य 7·3·22

   Part	Lexeme	Sandhi form	Meaning	Stem
   nन्	naन	naन	not	naन