In large bowl, combine flour, baking powder, baking soda and salt; mix well. Using fork or pastry blender, cut in 1 cup margarine until mixture is crumbly. In small bowl, beat eggs. Gradually add sugar, 1 teaspoon vanilla and lemon extract, beating until light. Add to flour mixture in large bowl. Stir by hand until dough forms. (If necessary, knead dough with hands to mix in dry ingredients.) Cover with plastic wrap; refrigerate 1 hour for easier handling.