Did M1 , M2 , and M3 employ a editor of a film
SELECT count(*) WHERE {
?x0 ns:film.editor.film ?x1 .
?x1 a ns:film.film .
M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}