Pāṇini sūtras

After dakshiṇâ and uttara, (referring to a.direction or a locality or a time, and ending with locative, ablative or nominative) comes the affix atasuch (at<u>as)

1. dakṣiṇa+uttarābhyāmदक्षिण+उत्तराभ्याम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	dakṣiṇaदक्षिण	dakṣiṇaदक्षिण	southern	dakṣiṇदक्षिण् + plus aअ
   uउ	uttaraउत्तर	uttarābhyāmउत्तराभ्याम्	northern	uttarउत्तर् + plus ābhy&आभ्य्&

2. atasucअतसुच्

   Part	Lexeme	Sandhi form	Meaning	Stem
   aअ	atasucअतसुच्	atasucअतसुच्	atasucअतसुच्	atasucअतसुच्

Anuvṛtti

1. astātiḥअस्तातिः 5·3·27

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