Pāṇini sūtras

The affix ‘tumun’ comes after a verb, when another verb meaning ‘to wish’ is in construction, provided that the agent of both the verbs is the same.

1. samāna+kartṛkeṣuसमान+कर्तृकेषु

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	samānaसमान	samānaसमान	identical	samānसमान् + plus aअ
   kक्	kartṛkaकर्तृक	kartṛkeṣuकर्तृकेषु	agens	kartṛkकर्तृक् + plus eṣuएषु

2. tumunतुमुन्

   Part	Lexeme	Sandhi form	Meaning	Stem
   tत्	tumunतुमुन्	tumunतुमुन्	tumunतुमुन्	tumunतुमुन्

Anuvṛtti

1. icchā+artheṣuइच्छा+अर्थेषु 3·3·157

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   iइ	icchāइच्छा	icchāइच्छा	desire	icchइच्छ् + plus āआ
   aअ	arthaअर्थ	artheṣuअर्थेषु	sense	arthअर्थ् + plus eṣuएषु