If order doesn't matter and it would be okay for duplicates *within* a list to 
be deleted, you might make use of

* Lists can be converted to sets, via list->set and back again
* There are many set methods to yield unions, intersections and differences 
between sets. See https://docs.racket-lang.org/reference/sets.html.

That should be a good start. Follow up if you get stuck.

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