Pāṇini sūtras

The sârvadhâtuka affix se (the ending of the second Person Present and Imperative Atmanepada) gets the augment iṭ after īś (Ad. 10)

1. īśaḥईशः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   īई	īśईश्	īśaḥईशः	īś [verb]ईश् [वेर्ब्]	īśईश् + plus aḥअः

2. seसे

   Part	Lexeme	Sandhi form	Meaning	Stem
   sस्	seसे	seसे	se [ending]	seसे

Anuvṛtti

1. va+l+ādeḥव+ल्+आदेः 7·2·35

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vaव	vaव	vakāraवकार	vव् + plus aअ
   lल्	lल्	lल्	LL	lल्
   āआ	ādiआदि	ādeḥआदेः	first syllable	ādआद् + plus eḥएः

2. sārvadhātukeसार्वधातुके 7·2·76

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	sārvadhātuसार्वधातु	sārvadhātukeसार्वधातुके	sārvadhātukaसार्वधातुक	sārvadhātukसार्वधातुक् + plus eए