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The sets do not have any ofThen the intersection which is infinite too remain infinite.
the cardinalities which would change.
The sets have a different cardinality,
one which does not change when the set changes.
After all the swapsLike the intersection.
(of which no swap is a change in cardinality)
what remains is a proper subset
(which is not a change in cardinality).
Because infinite.
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