question: Did a film producer employ M1 's star , director , and writer
query: SELECT count(*) WHERE {
  ?x0 a ns:film.producer .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x1 ns:film.actor.film/ns:film.performance.film M1 .
  ?x1 ns:film.director.film M1 .
  ?x1 ns:film.writer.film M1
  }