Pāṇini sūtras

After a word ending in ḍ, there may optionally be added the augment dh to a word beginning with s

German Nach einem auslautenden ḍ kann dh vor s antreten. (29)

1. ḍaḥडः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   ḍड्	ḍड्	ḍaḥडः	ḍakāraडकार	ḍड् + plus aḥअः

2. siसि

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	sस्	siसि	sakāraसकार	sस् + plus iइ

3. dhuṭधुट्

   Part	Lexeme	Sandhi form	Meaning	Stem
   dद्	dhuṭधुट्	dhuṭधुट्	dhuṭधुट्	dhuṭधुट्

Anuvṛtti

1. vāवा 8·3·26

   Part	Lexeme	Sandhi form	Meaning	Stem
   vव्	vāवा	vāवा	optionally	vāवा