question: Was a production company whose employee wrote M2 and M3 a art director 's employer
query: SELECT count(*) WHERE {
  ?x0 a ns:film.production_company .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
  ?x1 a ns:film.film_art_director .
  ?x2 ns:film.writer.film M2 .
  ?x2 ns:film.writer.film M3
  }