[ num ] sp capword sp capword sp othword sp othword sp capword sp / sp capword . sp othword sp capword sp capword , sp capword sp caplet . sp caplet . sp capword , sp capword othword sp caplet othword othword . sp – – sp capword - capword , sp year . sp – – sp upword : sp num - year - num - num - num . sp – – sp upword : sp othword : / / othword . othword / num . num / othword .