Cream together butter,shortening and sugar. Add eggs and blend well. Sift together flour, baking soda and cream of tartar. Add flour mixture gradually to butter mixture. Add vanilla and chill. Roll on floured surface to 1/4 inch thick and cut with cookie cutter or use cookie press. Place on ungreased cookie sheet. Bake at 350° for 6 to 8 minutes. Frost and sprinkle with colored sugars.
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