docs: protected ArrayList<Snak> getSnakList(PropertyIdValue propertyIdValue) {
  		ArrayList<Snak> result = this.snaks.get(propertyIdValue);
  		if (result == null) {
  			result = new ArrayList<Snak>();
  			this.snaks.put(propertyIdValue, result);
  		}
  		return result;
  	}