Pāṇini sūtras

The word putra coming after a Masculine noun in a Tatpurusha has acute on the first syllable.

1. putraḥपुत्रः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	putraपुत्र	putraḥपुत्रः	putra [word]	putrपुत्र् + plus aḥअः

2. puṃbhyaḥपुंभ्यः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	puṃsपुंस्	puṃbhyaḥपुंभ्यः	masculine	puṃsपुंस् + plus hyaḥह्यः

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. tatpuruṣeतत्पुरुषे 6·2·123

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tatpuruṣaतत्पुरुष	tatpuruṣeतत्पुरुषे	tatpuruṣaतत्पुरुष	tatpuruṣतत्पुरुष् + plus eए