question: Was a film director that M2 was edited by , M3 was directed by , and a film was produced by M1
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  M1 ns:film.director.film M3 .
  M1 ns:film.editor.film M2 .
  M1 ns:film.producer.film|ns:film.production_company.films ?x0
  }