private final boolean checkSetConsistency(Element newEl){
		
		int count = 0;
		Iterator<Element> itr = elements.iterator();
		while(itr.hasNext()){
			Element el = itr.next();
			if(el.getDoors() == newEl.getDoors()) count++;
			if(el.getLuggage() == newEl.getLuggage())count++;
			if(el.getMaintenance() == newEl.getMaintenance())count++;
			if(el.getPersons() == newEl.getPersons())count++;
			if(el.getPrice() == newEl.getPrice())count++;
			if(el.getSafety() == newEl.getSafety())count++;
			
			if(count >= 5){
				return false;
			}else count=0;
		}
		
		return true;
	}