Pāṇini sūtras

The Guṇa is substituted for the final vowel ik of a stem before the affixes called sârvadhâtuka and ârdhadhâtuka (III.4.113 &c).

1. sārvadhātuka+ārdhadhātukayoḥसार्वधातुक+आर्धधातुकयोः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	sārvadhātuसार्वधातु	sārvadhātukaसार्वधातुक	sārvadhātukaसार्वधातुक	sārvadhātukसार्वधातुक् + plus aअ
   āआ	ārdhadhātuआर्धधातु	ārdhadhātukayoḥआर्धधातुकयोः	ārdhadhātukaआर्धधातुक	ārdhadhātukआर्धधातुक् + plus ayoḥअयोः

Anuvṛtti

1. guṇaḥगुणः 7·3·82

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   gग्	guṇaगुण	guṇaḥगुणः	guṇaगुण	guṇगुण् + plus aḥअः