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Software Design for Flexibility Ch. 2.1.1
(define (identity x) x)
(define (compose f g)
(define (the-composition . args)
(f (apply g args)))
(define ((iterate n) f)
(if (= n 0)
(compose f ((iterate (- n 1)) f))))
(define (square n) (* n n))
(((iterate 3) square) 5)
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