This is one of my favorite paradoxes:
There are sets that are members of themselves such as a set of flocks of sheep is also a flock of sheep.
There are sets that are not members of themselves for example a set of spoons is not a spoon.
If there is a set of sets that are not member of themselves is it a member of itself?
What makes it a paradox is obviously the fact that if it is a member of itself it cannot be a member of itself and if its not then it is.
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