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[racket] [htdp] Help with Exercise 12.4.2

From: Sam Griff (sgriff89 at gmail.com)
Date: Wed Jul 7 15:12:43 EDT 2010		 
I think I got it! It produces the correct results, but I'm not sure if
it follows the design pattern properly:

 [SOLUTION REMOVED FROM ARCHIVE]

Thank you everyone for all your help!
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