What cinematographer that M5 , M6 , and M7 were played by was employed by M1 , M2 , M3 , and M4
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.cinematographer .
?x0 ns:film.actor.film/ns:film.performance.character M5 .
?x0 ns:film.actor.film/ns:film.performance.character M6 .
?x0 ns:film.actor.film/ns:film.performance.character M7 .
?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
}