What film whose writer wrote M3 and M4 did M1 and M2 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.written_by ?x1 .
?x1 ns:film.writer.film M3 .
?x1 ns:film.writer.film M4
}