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Heat the oil in a large heavy saucepan over medium heat. Add the flour and cook, stirring constantly, until the flour is browned; be careful not to let the flour burn. Stir in the chili powder, cumin, garlic powder, salt and pepper and cook, stirring constantly, for 2-3 minutes.
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Gradually add the water, stirring until smooth. Cook, stirring frequently, for 5 minutes, then reduce the heat and boil gently for 15 minutes.
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