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Jan 18th, 2018
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  1. (defun fact (x &optional (acc 1)
  2. (if (zerop x) acc
  3. (fatt (- 1 x) (* x acc))))
  4.  
  5. (defun fatt (x)
  6. (if (zerop x) 1
  7. (* x (fatt (- x 1))))
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