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list-with-insertion (better version!) added by sdegutis on Tue Oct 25 17:14:43 2011

(define (list-with-insertion lst idx val)
  (cond
    [(zero? idx) (cons val lst)]
    [(null? lst) lst]
    [else
      (cons
        (car lst)
        (list-with-insertion (cdr lst) (- idx 1) val))]))
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What is the operator to construct pairs?
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