    Sentence 1: Yes, Elizabeth Taylor,  Norman Mailer, Warren Beatty, David  Rockefeller, and Mick jesse will go-to a  nightclub, but only if they are reasonabl  certain that Diana Ross, William p  Buckley Jr.,,Salvador Dali, Betty Ford,  Frank Sinatra, Mikhail Baryshnikov, and  the king of Cyprus will show up too--    vice versa.    Sentence 2: A group of celebrities will  be at the nightclub as long as another  specific group is there.