question: Who produced , executive produced , wrote , and directed a film written by M2 , M3 , and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.director.film ?x1 .
  ?x0 ns:film.producer.films_executive_produced ?x1 .
  ?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
  ?x0 ns:film.writer.film ?x1 .
  ?x1 a ns:film.film .
  ?x1 ns:film.film.written_by M2 .
  ?x1 ns:film.film.written_by M3 .
  ?x1 ns:film.film.written_by M4
  }