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[plt-scheme] Help: I want to travel a binary tree?

From: Zeng Fucen (zengfucen at gmail.com)
Date: Mon Jul 30 04:20:57 EDT 2007		 
I'm a scheme novice,

I want to travel a binary tree, how to ? (depth first)

Thanks for your tips , first!

I define a tree like this:  (1 (2 4 5) (3 6 7))
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