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Preheat oven to 325 degrees. Butter and flour three 6-inch cake pans and two 9-inch cake pans.
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In a large bowl, or the bowl of your mixer, combine flours, sugar, baking powder and soda, and salt.
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Add butter and beat on low until mixture is sandy.
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Create a well in the center and add eggs, sour cream, coconut milk, and extracts.
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Mix on low speed for 2-3 minutes. Fold batter with a spatula to combine remaining ingredients if necessary.
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Evenly pour batter into cake pans and bake for 30-35 minutes or until a toothpick is inserted and comes out with a few moist crumbs.
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Cool cakes in pans for 10-15 minutes, then invert to remove cakes on a wire rack to cool completely.