Pāṇini sūtras

To the words uttara, adhara and dakshiṇa is added the affix âti, in the sense of astâti.

1. uttara+adhara+dakṣiṇātउत्तर+अधर+दक्षिणात्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	uttaraउत्तर	uttaraउत्तर	northern	uttarउत्तर् + plus aअ
   aअ	adharaअधर	adharaअधर	lower	adharअधर् + plus aअ
   dद्	dakṣiṇaदक्षिण	dakṣiṇātदक्षिणात्	southern	dakṣiṇदक्षिण् + plus ātआत्

2. ātiḥआतिः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   āआ	ātiआति	ātiḥआतिः	ātiआति	ātआत् + plus iḥइः

Anuvṛtti

1. astātiḥअस्तातिः 5·3·27

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