Grease 15x10x1 inch or 13x9x2 baking pan; set aside. Combine flour, sugar, baking soda, and salt; set aside. In a med saucepan combine butter, cocoa powder, and 1 C. water. Bring mixture just to boiling, stirring constantly. Remove from heat. Add the chocolate mixture to dry mixture and beat with an electric mixer on med to high speed until thoroughly combined.
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