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[racket] Why is x can be simultenaously bind and not bind ?

From: Andre Mayers (Andre.Mayers at USherbrooke.ca)
Date: Sun Sep 15 09:26:03 EDT 2013		 
Another way to ask the question is why is it possible to execute 
(let ([x 'uuu])
  (set! x 'a)
  x)

and 

(let ([x 'uuu])
  (define x 'a)
  x)
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