/**
 ******************************************************************************
 *                    HOMEWORK:  15-121
 ******************************************************************************
 *                    Text concordance program
 ******************************************************************************
 *
 * Comparator for sorting words by frequency.
 *
 *
 *****************************************************************************/

public class Frequency implements java.util.Comparator<Word>
{
   public int compare(Word x, Word y)
   {
		throw new RuntimeException ("You need to implement this method");
   }
}