What employer of M0 , M1 , M2 , and M3 was a film producer 's country of nationality
SELECT DISTINCT ?x0 WHERE {
?x0 ^ns:people.person.nationality ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
?x1 a ns:film.producer
}