Sift together flour and sugar in bowl. Heat butter, oil, cocoa and cola to boiling point. Remove from heat. Stir in marshmallows. Stir until melted. Pour over flour and sugar, mix well. Add milk, soda, eggs and vanilla, beat at medium speed 2 minutes. Bake in greased and floured 9x12 pan for 35 minutes. Frost while warm.
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