Pāṇini sūtras

After the verbs tan ‘to expand, and others there is optionally the luk-elision of sic when the Atmanepada affixes ta and thās of the second person follow.

1. tana+ādibhyaḥतन+आदिभ्यः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tanaतन	tanaतन	tanतन्	tanतन् + plus aअ
   āआ	ādiआदि	ādibhyaḥआदिभ्यः	etc.	ādआद् + plus ibhyãइभ्य̃

2. ta+thāsoḥत+थासोः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	taत	taत	taत	tत् + plus aअ
   tत्	thāsथास्	thāsoḥथासोः	thāsथास्	thāsथास् + plus oḥओः

Anuvṛtti

1. lukलुक् 2·4·58

   Part	Lexeme	Sandhi form	Meaning	Stem
   lल्	lukलुक्	lukलुक्	suffix elision	lukलुक्

2. sicaḥसिचः 2·4·77

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	sicसिच्	sicaḥसिचः	aorist	sicसिच् + plus aḥअः

3. vibhāṣāविभाषा 2·4·78

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