What film producer wrote M6 's prequel and executive produced M1 , M2 , M3 , M4 , and M5
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.producer .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:film.producer.films_executive_produced M2 .
?x0 ns:film.producer.films_executive_produced M3 .
?x0 ns:film.producer.films_executive_produced M4 .
?x0 ns:film.producer.films_executive_produced M5 .
?x0 ns:film.writer.film ?x1 .
?x1 ns:film.film.sequel M6
}