Who was a French costume designer that M6 and M7 were directed by and M2 , M3 , and M4 were written by
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film_costumer_designer .
?x0 a ns:people.person .
?x0 ns:film.director.film M6 .
?x0 ns:film.director.film M7 .
?x0 ns:film.writer.film M2 .
?x0 ns:film.writer.film M3 .
?x0 ns:film.writer.film M4 .
?x0 ns:people.person.nationality ns:m.0f8l9c
}