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[racket] combine-in doesnt combine?

From: Stephen Chang (stchang at ccs.neu.edu)
Date: Tue Oct 8 19:07:38 EDT 2013		 
What is the intended use case of combine-in? The docs says it does a
union but that doesnt seem to be true.

(require (combine-in lang/htdp-beginner 2htdp/image))

module: identifier already imported from a different source in:
  image?
  (rename 2htdp/image image? image?)
  (rename lang/htdp-beginner image? image?)
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