code: public Map<Integer, String> getInvertedIndex() {
  		TreeMap<Integer, String> inverted = new TreeMap<Integer, String>();
  		Iterator<String> keyiter = this.tokenForm2index.keySet().iterator();
  		while (keyiter.hasNext()) {
  			String key = keyiter.next();
  			int[] index = tokenForm2index.get(key);
  			Integer i = Integer.valueOf(index[0]);
  			inverted.put(i, key);
  		}
  		return inverted;
  	}
docs: Return a map with Integers as keys and attribute labels as value*