Which Canadian producer of a film was M0 's writer
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
?x0 ns:film.writer.film M0 .
?x0 ns:people.person.nationality ns:m.0d060g .
?x1 a ns:film.film
}