Sūtra 7·1·76
छन्दस्य् अपि दृश्यते
chandasy api dṛśyate
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In the Veda also, the stems ‘asthi’, ‘dadhi’, ‘sakthi’ and ‘akshi’, are found to take the substitute anaṅ, before endings other than those mentioned above.
Padapāṭha chandasi api dṛśyateछन्दसि अपि दृश्यते