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Mix cake batter according to package directions. Bake the cake batter according to the package directions for two 9 inch round layers; let cool, then remove from the pans. Meanwhile, in a medium sized bowl, combine the ricotta cheese, chocolate chips, 1/4 cup granulated sugar, the vanilla, and cinnamon; mix well, then cover and chill. In a small bowl, combine the rum, water and the remaining 2 tablespoons granulated sugar; mix, then set aside. Place 1 cake layer on a serving platter and drizzle with the rum mixture. Cover with the ricotta cheese mixture and top with the second layer. In a medium sized bowl, with an electric mixer on high speed,