SICP solution exercise 2.31

Solution for exercise 2.31 of SICP:

(define (square x)
  (* x x))

(define (tree-map function tree)
  (map (lambda (subtree)
         (if (pair? subtree)
             (tree-map function subtree)
             (function subtree)))

(define (square-tree tree) (tree-map square tree))

 (list 1
       (list 2 (list 3 4) 5)
       (list 6 7)))
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