Did a film producer employ M1 and M2 and employ M3 's Canadian executive producer
SELECT count(*) WHERE {
?x0 a ns:film.producer .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x1 ns:film.producer.films_executive_produced M3 .
?x1 ns:people.person.nationality ns:m.0d060g
}