What executive producer and star of M0 executive produced M1 and executive produced M2
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.actor.film/ns:film.performance.film M0 .
?x0 ns:film.producer.films_executive_produced M0 .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:film.producer.films_executive_produced M2
}