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Preheat oven to 300°F.
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Combine graham cracker crumbs, 2 tablespoons sugar and margarine in medium bowl and mix until well combined and all crumbs are moist. Press mixture into the bottom and 1/2 up the sides of a 12 inch to 14 inch springform pan. Set aside.
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In large mixing bowl, beat the 4 packages cream cheese until smooth and fluffy. Add eggs 2 at a time and beat well after each addition. Gradually add sugar, mix well. Add 2 teaspoons vanilla and evaporated milk and mix well.
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Pour filling onto the graham crust. Bake at 300 degrees for 1 hour and 15 minutes on bottom rack of oven.
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Remove cake from the oven and let cool for 10 minutes.
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During 10 minute cool down, combine sour cream, 9 tablespoons sugar and 2 tsp vanilla in a bowl. When cake has cooled for 10 minutes, spread the sour cream mixture on top of the cake. Bake cake for an additional 5 minutes then remove from the oven.
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Cool cake completely before removing the sides of the springform pan. Serve cake well-chilled.