What was a film that was edited by M1 and M2 and was edited by M3 and M4
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
}