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Preheat oven to 350°F.
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Sift flour, baking powder, baking soda and set aside.
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Cream together the sugar and margarine.
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Beat in vanilla and eggs, one at a time.
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Alternately add dry ingredients and buttermilk until well blended.
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Spread batter evenly into greased and floured cake pans.
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Bake for 27 to 35 minutes on middle rack, until toothpick inserted in centre comes out clean.
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Cool 10 minutes in pans before removing to wire rack.
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Cool completely and frost or fill as desired.
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Cake can also be baked in a 13 x 9 inch or Bundt pan.
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For orange marble cake: reserve 1 cup of the batter add to it 2 to 3 squares melted and cooled semi-sweet chocolate, add orange zest to remaining yellow batter and swirl chocolate batter through orange batter for marbled effect.