private int countWords(List<Sentence> sentences) {
    int count = 0;
    for (Sentence sentence : sentences) {
      count += wordLexer.tokenize(sentence).size();
    }

    return count;
  }
  private int countSyllables(List<Sentence> sentences) {
    int count = 0;
    for (Sentence sentence : sentences) {
      for (Word word : wordLexer.tokenize(sentence)) {
        count += syllableLexer.count(word);
      }
    }

    return count;
  }