[plt-scheme] Re: My Scheme Probelm (fwd)

> Is it possible some how to use AND and OR with Scheme, or something 
> similar to that?

You may want to look at:

     http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-7.html#node_chap_4

The question you're asking is at a novice level.  If you're dealing with 
graph structures and recursive traversals, you should already know how to 
handle conditionals, so I'm a bit perplexed at the apparent gap of 
knowledge.  Forgive me if that sounds presumptuous.  Have you looked 
through HTDP or any other introductory Scheme material?