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