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Preheat oven to 350degrees F.
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Grease the bases of four 8 inch pans,donot grease sides.
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You will need three bowls (two large, one small).
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Beat egg whites until soft peaks form.
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Gradually add 1/2 cup sugar while continuing to beat until very stiff in large bowl of mixer.
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Mix egg yolks, oil, water, and vanilla together in a small bowl.
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Sift together the dry ingredients into the other large bowl- 1 cup sugar, flour, baking powder, and salt.
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Add the egg yolk mixture to the dry ingredients.
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Mix well.
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Fold in stiffly beaten egg whites and gently incorporate.
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Pour into prepared pans.
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Bake at 350 degree for about 25 minutes, well risen and top springs back in the center.
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Turn baking pan onto a rack immediately and let cool.Run a knife through the sides and take out from pan.