[plt-scheme] HTDP Exercise 12.4.2 ... Help!

From: Emeka (emekamicro at gmail.com)
Date: Sun Apr 26 06:54:45 EDT 2009

Look twice at the expected result and use the power of brain to sketch the
procedures needed. Or pick small stones in your neighborhood next time you
take a walk with your dog, and use those stones to construct the answer.

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