Pāṇini sūtras

Both the na s are changed into ṇa in the reduplicated forms of the verb an, when preceded by an upasarga competent to cause the change.

1. ubhauउभौ

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	ubhउभ्	ubhauउभौ	both(a)	ubhउभ् + plus auऔ

2. sa+abhyāsasyaस+अभ्यासस्य

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saस	saस	with	saस
   aअ	abhyāsaअभ्यास	abhyāsasyaअभ्यासस्य	reduplication	abhyāsअभ्यास् + plus asyaअस्य

Anuvṛtti

1. ra+ṣābhyāmर+षाभ्याम् 8·4·1

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   rर्	raर	raर	rakāraरकार	rर् + plus aअ
   ṣष्	ṣaष	ṣābhyāmषाभ्याम्	ṣakāraषकार	ṣष् + plus ābhy&आभ्य्&

2. a+ṭ+ku+pu+āṅ+num+vyavāyeअ+ट्+कु+पु+आङ्+नुम्+व्यवाये 8·4·2

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	akāraअकार	aअ
   ṭट्	ṭट्	ṭट्	ṬṬ	ṭट्
   kक्	kuकु	kuकु	guttural	kक् + plus uउ
   pप्	puपु	puपु	labial consonant	pप् + plus uउ
   āआ	āṅआङ्	āṅआङ्	āआ	āṅआङ्
   nन्	numनुम्	numनुम्	numनुम्	numनुम्
   vव्	vyavāyaव्यवाय	vyavāyeव्यवाये	interposition	vyavāyव्यवाय् + plus eए

3. upasargātउपसर्गात् 8·4·14

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	upasargaउपसर्ग	upasargātउपसर्गात्	preposition	upasargउपसर्ग् + plus ātआत्

4. aniteḥअनितेः 8·4·19

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	anitiअनिति	aniteḥअनितेः	anअन्	anitअनित् + plus eḥएः