[Haskell-beginners] search a tree

[John Moore]

Hi All,
          I have an expression which contains several different let
statements let x = 4*5 and let Y = 6+4 for example. What I want to do is
traverse the tree and just return the variables. In other words I just want
it to return a list of all the variables in a tree. I have a function for
Var String.
So would it be something like
given a String -> [String] or is this expression ->String (gives back a
string)
Whats the best way to check or compare?

Jon
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