question: Which Canadian actor executive produced M1 and directed M3 and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.actor .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.director.film M4 .
  ?x0 ns:film.producer.films_executive_produced M1 .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }