What film was edited by M1 and M2 and directed by a screenwriter
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.directed_by ?x1 .
?x0 ns:film.film.edited_by M1 .
?x0 ns:film.film.edited_by M2 .
?x1 a ns:film.writer
}