Did M1 employ a film 's art director , writer , and producer
SELECT count(*) WHERE {
?x0 ns:film.film_art_director.films_art_directed ?x1 .
?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
?x0 ns:film.writer.film ?x1 .
?x1 a ns:film.film .
M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}