Pāṇini sūtras

The na of vana is optionally replaced by ṇa, when the cause of change occurs in the first member of the compound and which denotes a perrenial herb or a forest tree.

1. vibhāṣā+oṣadhi+vanaspatibhyaḥविभाषा+ओषधि+वनस्पतिभ्यः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vibhāṣविभाष्	vibhāṣāविभाषा	option	vibhāṣविभाष् + plus āआ
   oओ	oṣadhiओषधि	oṣadhiओषधि	herb	oṣadhओषध् + plus iइ
   vव्	vanaspatiवनस्पति	vanaspatibhyaḥवनस्पतिभ्यः	tree	vanaspatवनस्पत् + plus ibhyãइभ्य̃

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. vanamवनम् 8·4·4

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vanaवन	vanamवनम्	vana [word]	vanवन् + plus amअम्

4. pūrva+padātपूर्व+पदात् 8·4·3

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pūrvaपूर्व	pūrvaपूर्व	antecedent	pūrvaपूर्व
   pप्	padaपद	padātपदात्	word	padपद् + plus ātआत्