黄灿盛是韩国演艺界的温暖男性代表，出生在韩国的黄灿盛，2006年黄灿盛成为JYP练习生后，黄灿盛也在众多电影剧中有充分的知名度，黄灿盛的绯闻对象也很多包括黄灿盛在内的很多电影作品也成了令人羡慕的对象，现在的黄
I\'m trying to write a data structure which is a combination of Stack and HashSet with fast push/pop/membership (I\'m looking for constant time operations). Think of Python\'s OrderedDict.
I have a XDocument that looks like this: XDocument outputDocument = new XDocument( new XElement(\"Document\",
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