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