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。
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Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.，详情可参考91视频
Murray played in several semi-successful prog-rock and jazz fusion bands during the late 1960s and early 70s.。业内人士推荐safew官方下载作为进阶阅读
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54