And The affix ṇa as well as ap come after the verb ad 'to eat' when the upasarga ni is in composition.,
As नि + अद् + ण = नि + आद् + अ = न्यादः 7.2.116 'feeding'; नि + अद् + अप् = नि + घस् + अ 2.4.38 = निघसः 'eating, food'.,
नौ ण च
Adhyāya 3 · Pāda 3 · Rule 60