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

From: Synx (plt at synx.us.to)
Date: Fri Feb 5 18:56:07 EST 2010

Paulo J. Matos wrote:
> 
> Recently I had to implement infinite integer sets with union,
> intersection, setminus, etc...

Well, I dunno what setminus is, but...
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