Sūtra 8·2·74
सिपि धातो रुर्वा
sipi dhāto rurvā
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d or ru may optionally be substituted for the s of a root, before the Personal ending si (s), when such s stands at the end of a Pada.
Padapāṭha sipi dhātoḥ ruḥvāसिपि धातोः रुःवा