Sūtra 5·1·118
उपसर्गाच् छन्दसि धात्वर्थे
upasargāc chandasi dhātvarthe
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In the Chhandas, the affix vati is added to an Upasarga (Preposition), in the sense of a verbal root.
Padapāṭha upasargāt chandasi dhātuartheउपसर्गात् छन्दसि धातुअर्थे