question: What Canadian executive producer of a film did M0 employ
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.producer.films_executive_produced ?x1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  ?x1 a ns:film.film
  }