Pāṇini sūtras

The short is substituted for the ū of ūh when a Preposition precedes it, and an affix beginning with y with an indicatory k or ṅ follows.

1. upasargāt+hrasvaḥउपसर्गात्+ह्रस्वः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	upasargaउपसर्ग	upasargātउपसर्गात्	preposition	upasargउपसर्ग् + plus ātआत्
   hह्	hrasvaह्रस्व	hrasvaḥह्रस्वः	short	hrasvह्रस्व् + plus aḥअः

2. ūhateḥऊहतेः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   ūऊ	ūhatiऊहति	ūhateḥऊहतेः	ūhऊह्	ūhatऊहत् + plus eḥएः

Anuvṛtti

1. k+ṅ+itiक्+ङ्+इति 7·4·22

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   kक्	kक्	kक्	kakāraककार	kक्
   ṅङ्	ṅङ्	ṅङ्	ṅakāraङकार	ṅङ्
   iइ	itइत्	itiइति	itइत्	itइत् + plus iइ