Before an affix having an indicatory ḍ , the last vowel, with the consonant, if any, that follows it, is elided.,
Thus कुमुद्वत्, नड्वत् and वेतस्वत् with ड्मतुप् 4.2.87. So also त्रिंशता क्रीतः = त्रिंशकः with ड्वुन् of (V. I. 24). The rule applies even to non-bha bases, for effect must be given to the indicatory ड ॥ Thus उपसरजः, मन्दुरजः 3.2.97 with the krit affix उ) ॥,