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