Pāṇini sūtras

A word ending with the 4th case-affix is compounded with what denotes that which is for the purpose of what ends with the 4th case-affix and so too with the words artha ‘on account of,’ bali ‘a sacrifice,’ hita ‘salutary,’ sukha ‘pleasure’ and rakshita ‘kept,’ and the compound is called Tat-purusha.

1. caturthīचतुर्थी

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   cच्	caturthaचतुर्थ	caturthīचतुर्थी	fourth	caturthचतुर्थ् + plus īई

2. tad+artha+artha+bali+hita+sukha+rakṣitaiḥतद्+अर्थ+अर्थ+बलि+हित+सुख+रक्षितैः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tadतद्	tadतद्	this	tadतद्
   aअ	arthaअर्थ	arthaअर्थ	for	arthअर्थ् + plus aअ
   aअ	arthaअर्थ	arthaअर्थ	purpose	arthअर्थ् + plus aअ
   bब्	baliबलि	baliबलि	baliबलि	balबल् + plus iइ
   hह्	hitaहित	hitaहित	beneficial	hitहित् + plus aअ
   sस्	sukhaसुख	sukhaसुख	pleasant	sukhसुख् + plus aअ
   rर्	rakṣरक्ष्	rakṣitaiḥरक्षितैः	protect	rakṣitरक्षित् + plus aiḥऐः