Pāṇini sūtras

After the words shashṭi &c, when no other Numeral precedes them; tamaṭ is always the augment of ḍaṭ.

1. ṣaṣṭi+ādeḥषष्टि+आदेः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   ṣष्	ṣaṣ̊षष्̊	ṣaṣṭiषष्टि	ṣaṣṭi [word]षष्टि [wओर्द्]	ṣaṣṭषष्ट् + plus iइ
   āआ	ādiआदि	ādeḥआदेः	etc.	ādआद् + plus eḥएः

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

3. a+saṃkhyā+ādeḥअ+संख्या+आदेः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	not	aअ
   sस्	saṃkhyāसंख्या	saṃkhyāसंख्या	numeral	saṃkhyसंख्य् + plus āआ
   āआ	ādiआदि	ādeḥआदेः	beginning	ādआद् + plus eḥएः

Anuvṛtti

1. saṅkhyāyāḥसङ्ख्यायाः 5·2·47

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saṃkhyāसंख्या	saṅkhyāyāḥसङ्ख्यायाः	numeral	saṃkhyसंख्य् + plus āyआय्

2. pūraṇeपूरणे 5·2·48

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pūraṇaपूरण	pūraṇeपूरणे	ordinal number	pūraṇपूरण् + plus eए

3. tamaṭतमट् 5·2·56

   Part	Lexeme	Sandhi form	Meaning	Stem
   tत्	tamaṭतमट्	tamaṭतमट्	tamaṭतमट्	tamaṭतमट्

4. nityamनित्यम् 5·2·57

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	nityaनित्य	nityamनित्यम्	continuous	nityनित्य् + plus amअम्