What writer of M0 and M1 was M2 's Canadian executive producer
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.producer.films_executive_produced M2 .
?x0 ns:film.writer.film M0 .
?x0 ns:film.writer.film M1 .
?x0 ns:people.person.nationality ns:m.0d060g
}