Sūtra 7·2·61
अचस् तास्वत् थल्य् अनिटो नित्यम्
acas tāsvat thaly aniṭo nityam
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After a root, which ends in a vowel, and after which the Per. Fut. affix tâsi is always devoid of the augment iṭ; (after such a root) thal the persoual ending of the Perfect, like thās, does not also get the augment iṭ
Padapāṭha acaḥ tāsvat thali aniṭaḥ nityamअचः तास्वत् थलि अनिटः नित्यम्
