[plt-scheme] Binary tree Traversals

[Shrutarshi Basu]

Veer's solution worked. Thanks. I was under the impression that list
accepted only two inputs and then combined them. I can see that append
might give problems in my original code, because it would not always
get a list as input. Doing (cons (label node) '()) takes care of this,
I think. I'm still not sure I quite understand list and append though.
Could someone give me a brief rundown?
Thanks,
Basu

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