code: public String[][] toWordTagArray()
      {
          List<Word> wordList = toSimpleWordList();
          String[][] pair = new String[2][wordList.size()];
          Iterator<Word> iterator = wordList.iterator();
          for (int i = 0; i < pair[0].length; i++)
          {
              Word word = iterator.next();
              pair[0][i] = word.value;
              pair[1][i] = word.label;
          }
          return pair;
      }
docs: word pos
  
  @return