Alex is trying to lose weight and has set a goal to lose 10 pounds over the next 4 weeks. Each week, Alex plans to lose weight by reducing his calorie intake and increasing his exercise. In the first week, Alex loses 2 pounds. In the second week, he manages to lose 3 pounds. By the third week, he only loses 1 pound. How many pounds does Alex need to lose in the fourth week to achieve his goal? Let's think step by step and output the final answer within \boxed{}.
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