[plt-scheme] HtDP ex 11.2.4

From: Richard Cleis (rcleis at mac.com)
Date: Fri Feb 17 02:24:36 EST 2006

I unlearned everything that I knew about programming before starting 
through this book, and it hasn't yet revealed the likes of "list?" or 
"pair?" or "atom?".  Is this problem solvable with only the now 
well-worn "empty?" ?


"Without the requirement of mathematical aesthetics a great many 
discoveries would not have been made."
-- Albert Einstein

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