Which Chinese film producer was employed by M1 and M2 and employed by M4 's producer
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.producer .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.nationality ns:m.0d05w3 .
?x1 ns:film.producer.film|ns:film.production_company.films M4
}