Most classes are not members of themselves, but some are; for example, the class of non-men being itself not a man is a member of itself.
Let R be the cclass of all classes which are not members of themselves. If it exists, it is a member of itself if and only if it is not a member of itself: a contradiction, so it does not exist.
Let R be the cclass of all classes which are not members of themselves. If it exists, it is a member of itself if and only if it is not a member of itself: a contradiction, so it does not exist.
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