question: Was a screenwriter a Mexican art director of M2 , M3 , and M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:film.film_art_director.films_art_directed M2 .
  ?x0 ns:film.film_art_director.films_art_directed M3 .
  ?x0 ns:film.film_art_director.films_art_directed M4 .
  ?x0 ns:people.person.nationality ns:m.0b90_r
  }