It might also be a good move to read this:
http://www.catb.org/esr/faqs/smart-questions.html#intro

On Wed, Jun 28, 2017 at 12:21 PM, Glenn Hoetker <ghoet...@gmail.com> wrote:

> 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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