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这个问题据说在facebook上已经分享 …
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请观察这些数字和字母: 20, GC 1 …
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如果至少有一部分A不是B,有的B是C,那 …
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如果至少有一部分A不是B,有的A是C,那 …
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你有三个袋子,每个包里有两个球。袋子A包 …
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