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667. The two roots

The two roots  and dhā (the commonest of the class) lose their radical vowel altogether in the weak forms, being shortened to dad and dadh. In 2d sing. impv. act., they form respectively dehí and dhehí. In combination with a following t or th, the final dh of dadh does not follow the special rule of combination of a final sonant aspirate (becoming ddh with thet or th: 160), but — as also before s and dhv — the more general rules of aspirate and of surd and sonant combination; and its lost aspiration is thrown back upon the initial of the root (155).