Pāṇini sūtras

And the words tishṭhadgu, ‘at the time when the cows stand to be milked,’ &c. are Avyayûbhâva compounds.

1. tiṣṭhadgu+prabhṛtīniतिष्ठद्गु+प्रभृतीनि

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tiṣṭhadgतिष्ठद्ग्	tiṣṭhadguतिष्ठद्गु	tiṣṭhadgu [word]तिष्ठद्गु [wओर्द्]	tiṣṭhadguतिष्ठद्गु
   pप्	prabhṛtiप्रभृति	prabhṛtīniप्रभृतीनि	etc.	prabhṛtप्रभृत् + plus īniईनि

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	and	caच

Anuvṛtti

1. avyayībhāvaḥअव्ययीभावः 2·1·5

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	avyayībhāvअव्ययीभाव्	avyayībhāvaḥअव्ययीभावः	avyayībhāvaअव्ययीभाव	avyayībhāvअव्ययीभाव् + plus aḥअः