question: What was directed by M0 and M1 and produced by a Canadian director of M3 and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.directed_by M0 .
  ?x0 ns:film.film.directed_by M1 .
  ?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
  ?x1 ns:film.director.film M3 .
  ?x1 ns:film.director.film M4 .
  ?x1 ns:people.person.nationality ns:m.0d060g
  }