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Program 3
; Just currying (lambda (f (lambda (n) ...))). Not better - perhaps even worse... 



(let ((fac (lambda (f)
             (lambda (n)
              (if (= n 0) 1 (* n ((f f) (- n 1))))))))    ; GET RID OF (f f) 
  ((fac fac) 5))                                          ; BY ABSTRACTING IT OUT OF THE IF-FORM.