Pāṇini sūtras

A Preposition ending in i or u lengthens its final vowel, before the verb dā, when the latter is changed to ta

1. daḥदः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	dāदा	daḥदः	dāदा	dāदा + plus ḥः

2. tiति

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tत्	tiति	takāraतकार	tत् + plus iइ

Anuvṛtti

1. uttara+padeउत्तर+पदे 6·3·1

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	uttaraउत्तर	uttaraउत्तर	last	uttarउत्तर् + plus aअ
   pप्	padaपद	padeपदे	word	padपद् + plus eए

2. pūrvasyaपूर्वस्य 6·3·111

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pūrvaपूर्व	pūrvasyaपूर्वस्य	antecedent	pūrvaपूर्व + plus syaस्य

3. saṃhitāyāmसंहितायाम् 6·3·114

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saṃhitāसंहिता	saṃhitāyāmसंहितायाम्	continuous speech	saṃhitसंहित् + plus āyआय्

4. upasargasyaउपसर्गस्य 6·3·122

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	upasargaउपसर्ग	upasargasyaउपसर्गस्य	preposition	upasargउपसर्ग् + plus asyaअस्य

5. i+kaḥइ+कः 6·3·123

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   iइ	iइ	iइ	ikāraइकार	iइ
   kक्	kक्	kaḥकः	KK	kक् + plus aḥअः