[ capword sp num ] sp capword sp capword . sp capword sp capword sp othword sp capword sp capword sp ( othword ) : sp capword othword sp othword sp othword : sp othword , sp othword , sp othword sp othword . capword sp capword sp othword sp capword sp capword , sp othword . sp num , sp othword . sp num / num , othword sp num – num , sp capword sp year . sp capword sp othword .