The semi-vowel of ve 'to weave' is not vocalised in the Perfect.,
Thus ववौ, ववतुः, ववुः ॥ This root belongs to यजादि class and would have been vocalised before कित् affixes by 6.1.15; and before non-कित् affixes the Reduplicate syllable of the Perfect would have been vocalised by 6.1.17. Both vocalisations are prohibited here.,