In a large bowl, combine the flour, cornmeal, sugar, baking powder, baking soda and salt. In a small bowl, whisk the eggs, buttermilk and butter. Stir into dry ingredients just until moistened. Transfer to a 9-inch square baking pan coated with cooking spray. Bake at 400 degrees for 15-20 minutes or until top is lightly browned and a toothpick inserted near the center comes out clean. Serve warm.
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