docs: public List<String> phraseDel(String[] words){
  		List<String> list = new ArrayList<String>(); 
  		String s;
  		int length= words.length;
  		for(int i = 0; i < length; i++){
  			s = words[i];
  			if(!isStopWord(s))
  				list.add(s);
  		}
  		return list;
  	}