Pāṇini sūtras

After a verb that ends in a śal consonant, and has an ik vowel for its penultimate letter, and does not take iṭ (VII.2.10), ksa is the substitute of cli.

1. śa+laḥश+लः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   śश्	śaश	śaश	śakāraशकार	śश् + plus aअ
   lल्	lल्	laḥलः	LL	lल् + plus aḥअः

2. i+k+upadhātइ+क्+उपधात्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   iइ	iइ	iइ	ikāraइकार	iइ
   kक्	kक्	kक्	KK	kक्
   uउ	upadhāउपधा	upadhātउपधात्	penult	upadhउपध् + plus ātआत्

3. an+iṭaḥअन्+इटः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	naन	anअन्	not	naन
   iइ	iṭइट्	iṭaḥइटः	iṭइट्	iṭइट् + plus aḥअः

4. kṣaḥक्षः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   kक्	kṣaक्ष	kṣaḥक्षः	kṣaक्ष	kṣक्ष् + plus aḥअः

Anuvṛtti

1. cleḥच्लेः 3·1·44

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   cच्	cliच्लि	cleḥच्लेः	aorist ending	clच्ल् + plus eḥएः