Pāṇini sūtras

Before a Taddhita affix having an indicatory ñ, ṇ or k, the words ayathātatha and ayathāpura may have vṛiddhi of the first vowel of their first member, or that of the second member, in alternation.

1. yathātatha+yathāpurayoḥयथातथ+यथापुरयोः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   yय्	yathātathaयथातथ	yathātathaयथातथ	yathātatha [word]यथातथ [wओर्द्]	yathātathयथातथ् + plus aअ
   yय्	yathāpuraयथापुर	yathāpurayoḥयथापुरयोः	yathāpura [word]यथापुर [wओर्द्]	yathāpurयथापुर् + plus ayoḥअयोः

2. paryāyeṇaपर्यायेण

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	paryāyaपर्याय	paryāyeṇaपर्यायेण	alternation	paryāyपर्याय् + plus eṇaएण

Anuvṛtti

1. uttara+padasyaउत्तर+पदस्य 7·3·10

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	uttaraउत्तर	uttaraउत्तर	following	uttarउत्तर् + plus aअ
   pप्	padaपद	padasyaपदस्य	word	padपद् + plus asyaअस्य

2. pūrvasyaपूर्वस्य 7·3·26

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

3. nañaḥनञः 7·3·30

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	nañनञ्	nañaḥनञः	nañनञ्	nañनञ् + plus aḥअः