Pāṇini sūtras

After a word ending in ‘varga’, but not meaning a ‘letter or word’, the affixes yat and kha are optionally employed, in the sense of ‘who stays there’.

1. a+śabdeअ+शब्दे

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	not	aअ
   śश्	śabdaशब्द	śabdeशब्दे	phoneme	śabdशब्द् + plus eए

2. yat+khauयत्+खौ

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   yय्	yatयत्	yatयत्	yatयत्	yatयत्
   kक्	khaख	khauखौ	īnaईन	khख् + plus auऔ

3. anyatarasyāmअन्यतरस्याम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	anyataraअन्यतर	anyatarasyāmअन्यतरस्याम्	optional	anyataraअन्यतर + plus syāmस्याम्

Anuvṛtti

1. bhavaḥभवः 4·3·53

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   bब्	bhavaभव	bhavaḥभवः	being	bhavभव् + plus aḥअः

2. varga+antātवर्ग+अन्तात् 4·3·63

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vargaवर्ग	vargaवर्ग	varga [word]	vargवर्ग् + plus aअ
   aअ	antaअन्त	antātअन्तात्	end	antअन्त् + plus ātआत्