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ВсеОбществоПолитикаПроисшествияРегионыМосква69-я параллельМоя страна。业内人士推荐51吃瓜作为进阶阅读
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NASA astronaut who had medical problem in space breaks silence，更多细节参见同城约会
Today’s puzzle is a new twist on a classic genre: the “common knowledge” hat riddle in which logicians deduce facts about their hats based on what they know, and what they know others know.