Sūtra 8·4·61
उदः स्थास्तम्भोः पूर्वस्य
udaḥ sthāstambhoḥ pūrvasya
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After ud, in the room of the sa of sthâ and stambha, the substitute is a letter belonging to the class of the prior (i.e. a dental is substituted for this sa)
Padapāṭha udaḥ sthāstambhoḥ pūrvasyaउदः स्थास्तम्भोः पूर्वस्य