Pāṇini sūtras

A stem ending in a nasal, and followed by the affix viṭ or van, always substitutes long ā for its nasal.

German Vor den Suffixen v (das wieder abfällt) und van wird für den auslautenden Nasal ā substituirt. (41)

1. viṭ+vanoḥविट्+वनोः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	viṭविट्	viṭविट्	kvi	viṭविट्
   vव्	vanवन्	vanoḥवनोः	vanवन्	vanवन् + plus oḥओः

2. anunāsikasyaअनुनासिकस्य

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	anunāsikaअनुनासिक	anunāsikasyaअनुनासिकस्य	anunāsikaअनुनासिक	anunāsikअनुनासिक् + plus asyaअस्य

3. ā+tआ+त्

   Part	Lexeme	Sandhi form	Meaning	Stem
   āआ	āआ	āआ	ākāraआकार	āआ
   tत्	tत्	tत्	TT	tत्

Anuvṛtti

1. bhātभात् 6·4·22

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   bब्	bhaभ	bhātभात्	bhaभ	bhभ् + plus ātआत्