Which film did M1 , M2 , M3 , and M4 edit
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.edited_by M1 .
?x0 ns:film.film.edited_by M2 .
?x0 ns:film.film.edited_by M3 .
?x0 ns:film.film.edited_by M4
}