Did M3 employ a Chinese writer of M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
?x0 ns:film.writer.film M1 .
?x0 ns:people.person.nationality ns:m.0d05w3 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}