Which film distributor that employed M1 and M2 employed M3 and M4 and employed M5 and M6
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film_distributor .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M6
}