Pāṇini sūtras

The acutely accented an (anaṅ) is substituted for the finals of asthi, dadhi, sakthi and akshi, before the affixes of the Instrumental and the cases that follow it, which begin with a vowel.

1. asthi+dadhi+sakthi+akṣṇāmअस्थि+दधि+सक्थि+अक्ष्णाम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	asthiअस्थि	asthiअस्थि	asthi [word]	asthअस्थ् + plus iइ
   dद्	dadhiदधि	dadhiदधि	dadhi [word]	dadhदध् + plus iइ
   sस्	sakthiसक्थि	sakthiसक्थि	sakthi [word]	sakthसक्थ् + plus iइ
   aअ	akṣiअक्षि	akṣṇāmअक्ष्णाम्	akṣi [word]अक्षि [wओर्द्]	akṣअक्ष् + plus ṇण्

2. anaṅअनङ्

   Part	Lexeme	Sandhi form	Meaning	Stem
   aअ	anaṅअनङ्	anaṅअनङ्	anaṅअनङ्	anaṅअनङ्

3. udāttaḥउदात्तः

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

Anuvṛtti

1. vibhaktauविभक्तौ 7·1·73

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vibhaktiविभक्ति	vibhaktauविभक्तौ	inflectional suffix	vibhaktविभक्त् + plus auऔ

2. tṛtīyā+ādiṣuतृतीया+आदिषु 7·1·74

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tṛtīyतृतीय्	tṛtīyāतृतीया	instrumental	tṛtīyतृतीय् + plus āआ
   āआ	ādiआदि	ādiṣuआदिषु	beginning	ādआद् + plus iṣuइषु