Who executive produced M1 and M2 and directed M3 's prequel 's prequel
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:film.director.film ?x1 .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:film.producer.films_executive_produced M2 .
?x1 ns:film.film.sequel ?x2 .
?x2 ns:film.film.sequel M3
}