[racket] HTDP exersise 12.4.2

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Sun Aug 28 16:24:34 EDT 2011

On Aug 28, 2011, at 3:54 PM, cloud van der Merwe wrote:

> Thanks guys, any criticism will be appreciated!

Please don't post complete solutions on-line. 
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