Four Layer Dessert
["1 c. flour", "1/2 c. margarine, softened", "1/2 c. pecans, chopped"]
["Mix thoroughly and pat into a 9 x 13-inch pan.", "Bake for 15 minutes at 350\u00b0 if metal pan; if glass, bake at 325\u00b0.", "Cool completely."]
["flour", "margarine", "pecans"]