MIX AND SIFT FLOUR, SUGAR AND SALT. SET ASIDE. PUT MARGARINE, SHORTENING, COCOA AND WATER IN A SAUCE PAN. BRING TO A BOIL. POUR OVER DRY INGREDIENTS AND STIR. COMBINE EGGS, BUTTERMILK, SODA AND VANILLA IN ANOTHER BOWL. ADD TO ABOVE MIXTURE. MIX WELL ABOUT FIVE MINUTES BEFORE DONE PREPARE THE ICING!