code: def accept(self, title, titleAlignments):
          
  
          # Sanity check: titles can only be passed once.
          assert title not in self._titles, (
              'Title %r seen multiple times.' % title)
  
          readIds = titleAlignments.readIds()
          newReadsRequired = ceil(self._minNew * len(readIds))
  
          for readSet, invalidatedTitles in self._titles.values():
              if len(readIds - readSet) < newReadsRequired:
                  # Add this title to the set of titles invalidated by this
                  # previously seen read set.
                  invalidatedTitles.append(title)
                  return False
  
          # Remember the new read set and an empty list of invalidated titles.
          self._titles[title] = (readIds, [])
  
          return True
docs: Return C{True} if the read id set in C{titleAlignments} is sufficiently
          different from all previously seen read sets.
  
          @param title: A C{str} sequence title.
          @param titleAlignments: An instance of L{TitleAlignment}.
          @return: A C{bool} indicating whether a title has an acceptably novel
              read set or not.