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三个大学生甲、乙、丙,每个学生学习四门课 …
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数学教授杰夫人收养了7个儿子,名字分别是 …
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如果所有的A都不是B,所有的B都是C,那 …
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请根据给出的信息进行推理。 提示:4人可 …
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如果所有的A都不是B,所有的B都不是C, …
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如果有些A是B,而所有的B都是C,那么有 …
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如果有些A是B,而有些B是C,则有些A肯 …
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