3. The method of claim 2 , further comprising, in the event that no related topic cluster maps to the non-stop word, maintaining the non-stop word in the clustered version of the text.
2. The method of claim 1 , wherein identifying, for a non-stop word included in the set of non-stop words in the text, a corresponding related topic cluster includes looking up in a mapping of non-stop words to related topic clusters any candidate related topic clusters that map to the non-stop word.