The Ultimate Chocolate Cake
["2 c. flour", "2/3 c. cocoa", "1 1/4 tsp. baking soda", "1/4 tsp. baking powder", "1 2/3 c. sugar", "4 eggs", "1 tsp. vanilla", "1 c. Hellmann's mayonnaise", "1 1/3 c. water"]
["Grease and flour two 9-inch layer pans.", "Mix first 4 ingredients; set aside."]
["flour", "cocoa", "baking soda", "baking powder", "sugar", "eggs", "vanilla", "mayonnaise", "water"]