Preheat oven to 350 degrees. Grease the bottom of a 10x15x1 inch jelly roll pan, or cookie sheet with sides. Line the bottom with graham cracker squares. Bring the margarine, butter and sugar to a boil, over medum heat, and boil for 2 mins. Pour over crackers. Sprinkle with chopped nuts. Bake 18 mins. Cool and break into pieces. Store in tupperware or other tightly closed container.
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