What actor that M2 , M3 , and M4 were directed by was M1 's executive producer
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.actor .
?x0 ns:film.director.film M2 .
?x0 ns:film.director.film M3 .
?x0 ns:film.director.film M4 .
?x0 ns:film.producer.films_executive_produced M1
}