Line a 9 x5 x 3" pan with waxed paper. In a mixing bowl, combine margarine, sugar, egg white, and vanilla. In another mixing bowl, combine flour sugar, and baking powder. Mix wet ingredients with dry ingredients just until moistened. For each dough divided add each flavor or nut as indicated: red-rum, green-nuts, and chocolate. Pack the red-rum dough evenly over the bottom of the loaf pan, then green-nuts dough in the middle and chocolate on the top. Cover with waxed paper. Chill overnight. Heat oven to 375 degrees. Remove dough from pan. Begin cutting the dough into thirds, then cut into thin slices. Place on unprepared cookie sheet. Bake 12 minutes. ----