code: @Override
      public void incrementWordCount(String word, int increment) {
          T element = extendedVocabulary.get(word);
          if (element != null) {
              element.increaseElementFrequency(increment);
              totalWordCount.addAndGet(increment);
          }
      }
docs: Increment frequency for specified label by specified value
  
  @param word the word to increment the count for
  @param increment the amount to increment by