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Robert Smith committed 2a1d68e

Clarify wording.

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 ;;;; armstrong.lisp
 ;;;; Copyright (c) 2012 Robert Smith
 
-;;;; An Armstrong number is a number equal to the sum of the cube of
-;;;; its digits.
+;;;; An ``Armstrong number'' is a number equal to the sum of the cubes of
+;;;; each digit.
 
 (defun cube (x)
   "Return the cube of X."