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Cook macaroni according to package directions. Drain and set aside. Melt butter in a large heavy saucepan over low heat; add flour, stirring until smooth. Cook 3 to 5 minutes, stirring constantly. Turn heat to medium; gradually whisk in milk, and cook over medium heat, stirring or whisking constantly until thickened, about 10 minutes. Stir in pasta, mustard, and next 4 ingredients, stirring just until cheese begins to melt.
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