Pāṇini sūtras

The affix ṭhañ (±/—ika or ka) comes after a word denoting time, in the 3rd case in construction, in the sense of “to be subdued, to be gained or attained, to be completed and to be easily completed in that time”.

1. tenaतेन

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tadतद्	tenaतेन	instrumental	tadतद् + plus aअ

2. parijayya+labhya+kārya+sukaramपरिजय्य+लभ्य+कार्य+सुकरम्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	parijiपरिजि	parijayyaपरिजय्य	conquer	parijayyपरिजय्य् + plus aअ
   lल्	labhलभ्	labhyaलभ्य	get	labhyलभ्य् + plus aअ
   kक्	kṛकृ	kāryaकार्य	make	kāryकार्य् + plus aअ
   sस्	sukaraसुकर	sukaramसुकरम्	easy	sukarसुकर् + plus amअम्

Anuvṛtti

1. ṭhañठञ् 5·1·18

   Part	Lexeme	Sandhi form	Meaning	Stem
   ṭट्	ṭhañठञ्	ṭhañठञ्	ṭhañठञ्	ṭhañठञ्

2. kālātकालात् 5·1·78

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   kक्	kālaकाल	kālātकालात्	time	kālकाल् + plus ātआत्