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vaikrtas traya evaite
deva-sargas ca sattama
vaikarikas tu yah proktah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O good Vidura, these last three creations and the creation of demigods (the tenth creation) are vaikrta creations, which are different from the previously described prakrta (natural) creations. The appearance of the Kumaras is both.