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tvastur daityatmaja bharya
racana nama kanyaka
sannivesas tayor jajñe
visvarupas ca viryavan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Racana, the daughter of the Daityas, became the wife of Prajapati Tvasta. By his semen he begot in her womb two very powerful sons named Sannivesa and Visvarupa.