What was edited by a writer of M0 and M1 and edited by a film producer
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.edited_by ?x1 .
?x0 ns:film.film.edited_by ?x2 .
?x1 ns:film.writer.film M0 .
?x1 ns:film.writer.film M1 .
?x2 a ns:film.producer
}