Pāṇini sūtras

Optionally after para and avara, comes the affix atasuch, in the sense of astâti.

1. vibhāṣāविभाषा

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vibhāṣविभाष्	vibhāṣāविभाषा	option	vibhāṣविभाष् + plus āआ

2. para+avarābhyāmपर+अवराभ्याम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	paraपर	paraपर	para [word]	paraपर
   aअ	avaraअवर	avarābhyāmअवराभ्याम्	avara [word]	avarअवर् + plus ābhy&आभ्य्&

Anuvṛtti

1. astātiḥअस्तातिः 5·3·27

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	astātiअस्ताति	astātiḥअस्तातिः	astātiअस्ताति	astātअस्तात् + plus iḥइः

2. atasucअतसुच् 5·3·28

   Part	Lexeme	Sandhi form	Meaning	Stem
   aअ	atasucअतसुच्	atasucअतसुच्	atasucअतसुच्	atasucअतसुच्