protected String useDefinitions(String s) {
		s = useSystemVariables(s);
		s = useElementVariables(s);
		s = useAtomVariables(s, -1);
		s = useRbondVariables(s, -1);
		s = useAbondVariables(s, -1);
		s = useTbondVariables(s, -1);
		s = useObstacleVariables(s, -1);
		s = useMoleculeVariables(s, -1);
		s = super.useDefinitions(s);
		return s;
	}