A patient came to see the doctor. He coughed badly. The doctor said he didn't like the patient's cough and asked him to take off his shirt. He wanted to know how long the patient had his cough. The doctor asked if the patient took much exercise. The patient said that he didn't do it regularly and explained that he hadn't come about his cough. He said his feet hurt every time he walked. He had this pain for 2 weeks. Then he understood that he had new shoes for 2 weeks too.