What costume designer that M1 and M2 were written by and M4 , M5 , M6 , and M7 starred was M3 's employee
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film_costumer_designer .
?x0 ns:film.actor.film/ns:film.performance.film M4 .
?x0 ns:film.actor.film/ns:film.performance.film M5 .
?x0 ns:film.actor.film/ns:film.performance.film M6 .
?x0 ns:film.actor.film/ns:film.performance.film M7 .
?x0 ns:film.writer.film M1 .
?x0 ns:film.writer.film M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}