Combine dry cake mix and dry pudding mix in large bowl; blend in eggs, vanilla, water and oil. Pour half ito greased Bundt pan; set aside. Mix together sugar, cinnamon and walnuts in small bowl; sprinkle half over batter in pan. Swirl in with knife; add remaining batter. Swirl in remaining sugar mixture. Bake at 350 degrees for 50 minutes or until cake tests done. Cool in pan and remove to serving platter.
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