@Override
	public Boolean pertinent(String keyword1, String keyword2){
		for(int index = 0; index < children.length; index++){
			if(children[index].root.get_function().equals("suj")){
				Hashtable<String,Boolean> suj = new Hashtable<String,Boolean>();
				suj.put(keyword1, true);
				if(children[index].bfs_name(suj).isEmpty()) return false;
			}
			else if(children[index].root.get_function().contains("obj")){
				Hashtable<String,Boolean> obj = new Hashtable<String,Boolean>();
				obj.put(keyword2, true);
				if(children[index].bfs_name(obj).isEmpty()) return false;
			}
		}
		return true;
	}