Sūtra 3·3·56
एर् अच्
er ac
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The affix ‘ach’ comes after a root ending in ‘i’ or ‘û’ (when mere action is denoted, or when the sense is that of an appellative, the word being related to the verb from which its name is deduced, but not as an agent).
Padapāṭha eḥ acएः अच्