Pāṇini sūtras

The affix ṭhak comes in the sense of the locative case after the words ‘agrahâyanû’ and ‘asvattha’ ending in the first case-affix in construction and being the name of a full-noon night.

1. āgrahāyaṇī+aśvatthātआग्रहायणी+अश्वत्थात्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   āआ	āgrahāya&#आग्रहाय&#	āgrahāyaṇīआग्रहायणी	āgrahāyaṇī [word]आग्रहायणी [wओर्द्]	āgrahāyaṇआग्रहायण् + plus īई
   aअ	aśvatthaअश्वत्थ	aśvatthātअश्वत्थात्	aśvattha [word]अश्वत्थ [wओर्द्]	aśvatthअश्वत्थ् + plus ātआत्

2. ṭhakठक्

   Part	Lexeme	Sandhi form	Meaning	Stem
   ṭट्	ṭhakठक्	ṭhakठक्	ṭhakठक्	ṭhakठक्

Anuvṛtti

1. sañjñāyāmसञ्ज्ञायाम् 4·2·21

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saṃjñसंज्ञ्	sañjñāyāmसञ्ज्ञायाम्	name	saṃjñसंज्ञ् + plus āyआय्