code: public List classify(List data) {
  		List list = new ArrayList();
  		
  		for (int i = 0; i < data.size(); i++) {
  		    list.add(classify((String)data.get(i)));
  		}
  		
  		return list;
      }
docs: classify a list of observation.
  
  @param data contains a list of cps
  @return the list