Pāṇini sūtras

Even so in a new derivative from this stem ending in ḍha, formed with a Taddhita affix having an indicatory ñ, ṇ or k, there is vṛiddhi substitution for the first vowel of the second member, and optionally for the first vowel of the first member, in pravāhaṇeya and prāvāhaṇeya

1. tad+pratyayasyaतद्+प्रत्ययस्य

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tadतद्	tadतद्	that	tadतद्
   pप्	pratyayaप्रत्यय	pratyayasyaप्रत्ययस्य	affix	pratyayप्रत्यय् + plus asyaअस्य

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

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. vāवा 7·3·26

   Part	Lexeme	Sandhi form	Meaning	Stem
   vव्	vāवा	vāवा	optionally	vāवा

3. pravāhaṇasyaप्रवाहणस्य 7·3·28

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pravāhaṇaप्रवाहण	pravāhaṇasyaप्रवाहणस्य	pravāhaṇa [word]प्रवाहण [wओर्द्]	pravāhaṇप्रवाहण् + plus asyaअस्य