[plt-scheme] HTDP 12.4.2

From: Danny Yoo (dyoo at hkn.eecs.berkeley.edu)
Date: Fri Jun 23 10:15:03 EDT 2006

> In this particular example, it's actually possible to do without the 
> additional auxiliary.  Play it through --- I think you'll be surprised 
> by the definition once you get it it, because it isn't obvious, but it's 
> very cute.

Ack.  I need to correct myself: you might need an auxiliary here, but it's 
not the auxiliary you're thinking of.  *grin*

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