Pāṇini sūtras

Short a is optionally substituted for the vowel of the reduplicate in veṣṭ and ceṣṭ in the Reduplicated Aorist of the Causative.

1. vibhāṣāविभाषा

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

2. veṣṭi+ceṣṭyoḥवेष्टि+चेष्ट्योः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	veṣṭiवेष्टि	veṣṭiवेष्टि	veṣṭवेष्ट्	veṣṭवेष्ट् + plus iइ
   cच्	ceṣṭiचेष्टि	ceṣṭyoḥचेष्ट्योः	ceṣṭचेष्ट्	ceṣṭचेष्ट् + plus yoḥयोः

Anuvṛtti

1. abhyāsasyaअभ्यासस्य 7·4·58

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	abhyāsaअभ्यास	abhyāsasyaअभ्यासस्य	reduplication	abhyāsअभ्यास् + plus asyaअस्य

2. caṅ+pareचङ्+परे 7·4·93

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caṅचङ्	caṅचङ्	caṅचङ्	caṅचङ्
   pप्	paraपर	pareपरे	following	paraपर

3. a+tअ+त् 7·4·95

   Part	Lexeme	Sandhi form	Meaning	Stem
   aअ	aअ	aअ	akāraअकार	aअ
   tत्	tत्	tत्	TT	tत्