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m
formatting
 	/**
 	 *  countingSort() sorts an array of int keys according to the
 	 *  values of _one_ ''one'' of the base-16 digits of each key.  "whichDigit"
 	 *  indicates which digit is the sort key.  A zero means sort on the least
 	 *  significant (ones) digit; a one means sort on the second least