docs: def get_words(self):
          """ Get words matching the request search terms.
  
              Returns:
                  A dict in form:
                      {<search term>: {<matching word>: <number of times this word is found in the Storage>
                                      } // Repeated for every matching word.
                      } // Repeated for every search term.
          """
          return dict([(word_list.attrib['to'], dict([(word.text, word.attrib['count'])
                                                      for word in word_list.findall('word')]))
                       for word_list in self._content.findall('list')])