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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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(expt b n)
Returns b raised to the nth power for integer n >= 0.
Norman Walsh, <ndw@nwalsh.com>
(define (expt b n) ;; Exponentiation ;; (if (<= n 0) 1 (* b (expt b (- n 1)))))
