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Consider the following syntax for a term in the unsugared untyped calculus, represented as an s-expression: E::=(E)(EE)V where v is a variable. For example, the

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Consider the following syntax for a term in the "unsugared" untyped calculus, represented as an s-expression: E::=(E)(EE)V where v is a variable. For example, the term would be de-sugared to and then represented as the s-expression (f((f)(tg) g)) )). Write a scheme function fv which takes an s-expression of this sort, and returns a list of the free variables. E.g

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