[plt-scheme] Is there a set data-type?

On Fri, Feb 5, 2010 at 1:29 PM, Todd O'Bryan <toddobryan at gmail.com> wrote:
> What do people use for a set data-type? If there isn't one built-in,
> we're going to use a hash-table with #t as all the values.
>

There is an awesome set implementation in the data structures galore
in Planet. :-)

> Todd
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