Weigh or lightly spoon flour into a dry measuring cup; level with
a knife. Place flour in a large saucepan. Gradually add milk,
stirring with a whisk until blended. Cook over medium heat until
thick (about 8 minutes), stirring constantly with a whisk. Remove
from heat; let stand 4 minutes or until sauce cools to 155°. Add
cheeses, and stir until the cheeses melt. Stir in cooked macaroni,
salt, and black pepper.
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