docs: public List<T> getMostFrequentAll()
      {
          List<T> ret = new ArrayList<T>();
          int maxfreq = getMaximalFrequency();
          for (Map.Entry<T, Integer> entry : styles.entrySet())
          {
              if (entry.getValue() == maxfreq)
                  ret.add(entry.getKey());
          }
          return ret;
      }