Pāṇini sūtras

āṭ acutely accented is the augment of a verbal stem beginning with a vowel, in the Aorist, Imperfect and the Conditional.

German An vocalisch anlautende Wurzeln tritt statt dessen betontes ā an. (72)

1. āṭआट्

   Part	Lexeme	Sandhi form	Meaning	Stem
   āआ	āṭआट्	āṭआट्	āṭआट्	āṭआट्

2. a+c+ādīnāmअ+च्+आदीनाम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	akāraअकार	aअ
   cच्	cच्	cच्	CC	cच्
   āआ	ādiआदि	ādīnāmआदीनाम्	first syllable	ādआद् + plus īnईन्

Anuvṛtti

1. bhātभात् 6·4·22

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

2. aṭ+udāttaḥअट्+उदात्तः 6·4·71

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aṭअट्	aṭअट्	aṭअट्	aṭअट्
   uउ	udāttaउदात्त	udāttaḥउदात्तः	udāttaउदात्त	udāttउदात्त् + plus aḥअः