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Preheat oven to 350.
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Grease and lightly floura 13x9 inch baking pan and set aside.
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Beat cake mix, mayonnaise (Hellmann's or Best Foods preferred), water, and eggs in a large bowl with electric mixer on low speed for 30 seconds.
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Beat on medium speed scraping sides occasionally, 2 minutes.
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Pour into prepared pan.
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Combine coconut, brown sugar, and pecans in small bowl and set aside.
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Bake cake for 20 minutes and sprinkle with coconut mixture.
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Continue baking 15 minutes or until toothpick inserted in center comes out clean.
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Cool completely on wire rack.
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To serve, cut into squares.