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Find-variable procedure

Write a procedure find-variable that takes as arguments a variable and a compile-time environment and returns the lexical address of the variable with respect to that environment. For example, in the program fragment that is shown above, the compile-time environment during the compilation of expression <e1> is ((y z) (a b c d e) (x y)) . Find-variable should produce

(find-variable 'c '((y z) (a b c d e) (x y)))
(1 2)

(find-variable 'x '((y z) (a b c d e) (x y)))
(2 0)

(find-variable 'w '((y z) (a b c d e) (x y)))
not-found

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