Consider the following Scheme program: (define (mystery W) (cond ( (number? W) ( (number? (car W)) (cdr W)) (else (cons (mystery (car W)) (cdr W))) Note that number? is a built-in predicate that returns true if its argument is a number and false otherwise. a. (6%) What does the above Scheme function x do? b. (14%) What is the result of the following calls: (mystery (9 8 (2 4) (4 5)))) (mystery (( (5 3) (8)) (4)))

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