Did a employer of a art director employ M0 's producer
SELECT count(*) WHERE {
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
?x1 ns:film.producer.film|ns:film.production_company.films M0 .
?x2 a ns:film.film_art_director
}