Did M4 employ M5 and employ a art director that directed M1 and directed M2 and M3
SELECT count(*) WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:film.director.film M1 .
?x0 ns:film.director.film M2 .
?x0 ns:film.director.film M3 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person M5
}