Did M3 star a Canadian employee of M0 and M1
SELECT count(*) WHERE {
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.nationality ns:m.0d060g .
M3 ns:film.film.starring/ns:film.performance.actor ?x0
}