question: Did a film editor 's employer employ M0 's art director
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
  ?x1 ns:film.film_art_director.films_art_directed M0 .
  ?x2 a ns:film.editor
  }