Pāṇini sūtras

The acute falls on the final of words having the sense of ūna, and of kalaha, when they are second members in a compound, preceded by a term in the instrumental case.

1. ūna+artha+kalahamऊन+अर्थ+कलहम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   ūऊ	ūnaऊन	ūnaऊन	less	ūnऊन् + plus aअ
   aअ	arthaअर्थ	arthaअर्थ	sense	arthअर्थ् + plus aअ
   kक्	kalahaकलह	kalahamकलहम्	kalaha [word]	kalahकलह् + plus amअम्

2. tṛtīyāyāḥतृतीयायाः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tṛtīyतृतीय्	tṛtīyāyāḥतृतीयायाः	instrumental	tṛtīyतृतीय् + plus āyआय्

Anuvṛtti

1. udāttaḥउदात्तः 6·2·64

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

2. uttara+pada+ādiḥउत्तर+पद+आदिः 6·2·111

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	uttaraउत्तर	uttaraउत्तर	last	uttarउत्तर् + plus aअ
   pप्	padaपद	padaपद	word	padपद् + plus aअ
   āआ	ādiआदि	ādiḥआदिः	first syllable	ādआद् + plus iḥइः

3. antaḥअन्तः 6·2·143

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	antaअन्त	antaḥअन्तः	last syllable	antअन्त् + plus aḥअः