3. 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...

Extracted text: 3. 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. What does the above Scheme fumetion x do? | 13 Ja a3 % 判断品孤小是否为动发字 a. b. What is the result of the following calls: (mystery (9 8 (2 4) (4 5)))) (mystery (( (5 3) (8)) (4)))