Pāṇini sūtras

There is the substitution of this stem śīrṣan for śiras when a Taddhita-affix beginning with ya follows.

German Auch vor einem mit y anlautenden taddhita-Suffix erscheint dieser Stamm. (61)

1. yeये

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   yय्	yaय	yeये	yakāraयकार	yय् + plus eए

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

3. taddhiteतद्धिते

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	taddhitaतद्धित	taddhiteतद्धिते	taddhitaतद्धित	taddhitतद्धित् + plus eए

Anuvṛtti

1. upadeśeउपदेशे 6·1·45

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	upadeśaउपदेश	upadeśeउपदेशे	linguistics	upadeśउपदेश् + plus eए

2. śīrṣaशीर्ष 6·1·60

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   śश्	śīrṣशीर्ष्	śīrṣaशीर्ष	śīrṣan [word]शीर्षन् [wओर्द्]	śīrṣशीर्ष् + plus aअ