public void implementFather() {
		
		if(parents.size() == 0)
			return;
		else {
			for(int i = 0; i < parents.size(); ++i) {
				if(parents.get(i) != null)
					parents.get(i).implementFather();
			}
			
			for(int i = 0; i < parents.size(); ++i)
				attributes.addAll(parents.get(i).attributes);
		}
	}