Pāṇini sūtras

The fourth case-affix is employed after a crude-fomi which ends in an affix denoting ‘condition’ (abstract noun, III.3.11.) and having the force of the affix tum (or Infinitive of purpose).

1. tum+arthātतुम्+अर्थात्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tumunतुमुन्	tumतुम्	tumunतुमुन्	tumunतुमुन्
   aअ	arthaअर्थ	arthātअर्थात्	sense	arthअर्थ् + plus ātआत्

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

3. bhāva+vacanātभाव+वचनात्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   bब्	bhāvaभाव	bhāvaभाव	meaning	bhāvभाव् + plus aअ
   vव्	vacanaवचन	vacanātवचनात्	expressive(p)	vacanवचन् + plus ātआत्

Anuvṛtti

1. a+abhinihiteअ+अभिनिहिते 2·3·1

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	naन	aअ	not	naन
   aअ	abhidhāअभिधा	abhinihiteअभिनिहिते	express	abhihitअभिहित् + plus iteइते

2. caturthīचतुर्थी 2·3·13

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