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Sift together first four ingredients. Melt together margarine and cocoa powder and combine with flour mixture. Add soymilk and vanilla, and pour batter into prepared pan.
Combine brown sugar, white sugar, and 4 T cocoa powder, and sprinkle over batter. Pour coffee over the top (do not stir).
Bake at 350F/180C for 40 minutes.
posted by Tabihadashi