Which film editor employed by M1 and M2 and employed by M3 and M4 did M5 and M6 star
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.editor .
?x0 ns:film.actor.film/ns:film.performance.film M5 .
?x0 ns:film.actor.film/ns:film.performance.film M6 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M4
}