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