[plt-scheme] HtDP 12.4.2 Design Recipe Blues

From: Todd O'Bryan (toddobryan at gmail.com)
Date: Sun Mar 2 20:35:33 EST 2008

On Sun, Mar 2, 2008 at 4:34 PM, dave yrueta <dyrueta at gmail.com> wrote:
> Help!  I've fallen on HtDP problem 12.4.2 and I can't get up!
>  Here's a link -- http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-16.html#node_sec_12.4

Let me offer a somewhat unorthodox suggestion. Work through Section 13
and get used to list abbreviations and then take a look at this
problem again. It may be the nestings of conses and such that are
confusing you more than the functions themselves. Then again, that may
not be it at all.


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