Emma is trying to improve her running times over a month. In the first week, she runs an average of 2 miles per day. In the second week, she increases her average to 3 miles per day. In the third week, she maintains an average of 3 miles per day. In the fourth week, she runs an average of 4 miles per day. How many miles did Emma run in total over the month? Let's think step by step and output the final answer within \boxed{}.
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