What did a film producer 's Canadian employee write
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.written_by ?x1 .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x2 .
?x1 ns:people.person.nationality ns:m.0d060g .
?x2 a ns:film.producer
}