In large bowl, mix flour, sugar and salt. In saucepan mix together shortening, margarine, water and cocoa. Bring to a boil then mix with dry ingredients. In a small bowl mix eggs, buttermilk, baking soda and vanilla. Add to chocolate mixture. Combine well and pour into a greased and floured cookie sheet. Bake at 350 degrees for 25 minutes. During last 5 minutes of baking, prepare icing.
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