Pāṇini sūtras

The affix ṭach comes after the word brahnnma in a Tatpurusha compound, when the compound denotes a person belonging to a certain country..

1. brahmaṇaḥब्रह्मणः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   bब्	brahmanब्रह्मन्	brahmaṇaḥब्रह्मणः	brahman [word]	brahmब्रह्म् + plus aṇa&अण&

2. jānapada+ākhyāyāmजानपद+आख्यायाम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   jज्	jānapadaजानपद	jānapadaजानपद	national	jānapadजानपद् + plus aअ
   āआ	ākhyāआख्या	ākhyāyāmआख्यायाम्	name	ākhyआख्य् + plus āyआय्

Anuvṛtti

1. samāsa+antāḥसमास+अन्ताः 5·4·68

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	samāsaसमास	samāsaसमास	Sanskrit compound	samāsसमास् + plus aअ
   aअ	antaअन्त	antāḥअन्ताः	end	antअन्त् + plus āMआM

2. tatpuruṣasyaतत्पुरुषस्य 5·4·86

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tatpuruṣaतत्पुरुष	tatpuruṣasyaतत्पुरुषस्य	tatpuruṣaतत्पुरुष	tatpuruṣतत्पुरुष् + plus asyaअस्य

3. ṭacटच् 5·4·91

   Part	Lexeme	Sandhi form	Meaning	Stem
   ṭट्	ṭacटच्	ṭacटच्	ṭacटच्	ṭacटच्