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Put ribs in large, shallow, roasting pan.
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Bake, uncovered, at 350* for 1-1/2 hours.
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While ribs are cooking, mix sugars and cornstarch in med saucepan.
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Stir in ketchup, vinegar and water, bring to a boil.
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Cook and stir until thickened and clear.
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When ribs are done, remove and discard fat.
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Place back in pan, pour 1-1/2 cups sauce over ribs.
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Bake 30 minutes longer.
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Cut into serving size pieces; brush with sauce.