question: Which art director was a Canadian film producer that M2 and M3 were executive produced by
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 a ns:film.producer .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:film.producer.films_executive_produced M3 .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }