A logical fallacy in which both terms of a categorical syllogism are universal, but the conclusion is particular. This is a problem because some universal categories are not instantiated.

  All big hairy monsters in my room are under the bed.
  All beds in my room are in the corner.
  Therefore, some big hairy monsters are in the corner of my room.

To prove the fallacy, assume the premises are true but that there are no instances of the category. For example, i checked the corner of my room. No monsters found. Note that it's still an invalid argument even if the conclusion is true!

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