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In a medium bowl, combine flour, brown sugar, pumpkin pie spice, and cinnamon. Stir in pecans. Add melted butter, stirring to combine. Spread mixture into an ungreased 13x9-inch baking pan. Bake for 15 to 20 minutes, or until lightly browned, stirring occasionally to crumble. Let cool completely. Store in an airtight container.