Chocolate cheesecake

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Chocolate Cheesecake<br/>1 1/4 cups graham cracker crumbs<br/>2 tablespoons sugar<br/>3 tablespoons butter or margarine melted<br/>2 pounds cream cheese<br/>1 cup sugar<br/>8 ounces sour cream<br/>1/4 cup cocoa<br/>2 eggs<br/>1 cup flour<br/>3/4 cup heavy