Pāṇini sūtras

ṣ is substituted for the s of nis before the verb tap when the meaning is not that of ‘repeatedly making red hot’.

German Für das s von nis vor tap, wenn nicht von einem wiederholten Glühen die Rede ist. (102)

1. nisaḥनिसः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	nisनिस्	nisaḥनिसः	nisनिस्	nisनिस् + plus aḥअः

2. tapatauतपतौ

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tapatiतपति	tapatauतपतौ	tap	tapatतपत् + plus auऔ

3. an+āsevaneअन्+आसेवने

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	naन	anअन्	not	naन
   āआ	āsevanaआसेवन	āsevaneआसेवने	incandescence	āsevanआसेवन् + plus eए

Anuvṛtti

1. a+pada+antasyaअ+पद+अन्तस्य 8·3·55

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	not	aअ
   pप्	padaपद	padaपद	word	padपद् + plus aअ
   aअ	antaअन्त	antasyaअन्तस्य	last syllable	antअन्त् + plus asyaअस्य

2. i+ṇ+koḥइ+ण्+कोः 8·3·57

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   iइ	iइ	iइ	ikāraइकार	iइ
   ṇण्	ṇण्	ṇण्	NaNअ	ṇण्
   kक्	kuकु	koḥकोः	guttural	kक् + plus oḥओः

3. ta+ādauत+आदौ 8·3·101

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	taत	taत	takāraतकार	tत् + plus aअ
   āआ	ādiआदि	ādauआदौ	first syllable	ādआद् + plus auऔ

4. saḥसः 8·3·56

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	sस्	saḥसः	sakāraसकार	sस् + plus aḥअः