Four Layer Dessert
["3 1/4 c. chopped pecans", "1 1/2 c. sifted flour", "1 1/2 sticks margarine"]
["Mix and spread over greased 9 x 12-inch baking dish.", "Bake at 350\u00b0 for 20 minutes.", "Cool."]
["pecans", "flour", "margarine"]