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Example of recursion: number-interval
The function number-interval returns a list of integers from a lower bound to an upper bound
(define (number-interval f t)
 (if (<= f t)
     (cons f (number-interval (+ f 1) t))
The function number-interval-iter is an iterative, tail recursive variant of number-interval.
A sample dialogue with the number interval functions.
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The append function
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A list replication function