Hi,

I want to allow redefinition of already defined expressions (variables, 
procedures etc.), but Racket prevents me. I know, in DrRacket I can allow it 
via graphical preferences interface for Pretty Big and R5RS languages. However, 
I want to allow that operation in racket and sicp languages, too. There's no 
option for those languages in that graphical interface and no documentation, 
too (at least I couldn't have found). My question is, how can I do that? I want 
to allow multiple re-definitions over and over again, not just for once. Here, 
I attach an example and it's output.

Thanks in advance.

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Attachment: example.rkt
Description: Binary data

example.rkt:3:8: module: duplicate definition for identifier
  at: x
  in: (define-values (x) 2)
  context...:
   standard-module-name-resolver

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