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Thinking Step 2: 推理第一个人。如果他不想要，他会直接说“不”（因为只要有一个不要，全称命题为假）。他说“不知道”，说明他自己想要，但他不确定后面两个人想不想要。。Line官方版本下载是该领域的重要参考
Flavor Flav is a longtime supporter of women’s sports and attended various Olympic competitions this month. He posted his invitation on Monday, shortly after the women turned down the trip to Washington.，这一点在91视频中也有详细论述
Flight controllers at Nasa working out how to get the crippled Apollo 13 back to Earth.