question: Was M3 a film distributor whose employee directed M2 and wrote M0 and M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.writer.film M0 .
  ?x0 ns:film.writer.film M1 .
  M3 a ns:film.film_distributor .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }