question: Which film director that wrote M1 and executive produced M2 and M3 was a actor of M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.director .
  ?x0 ns:film.actor.film/ns:film.performance.character M4 .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:film.producer.films_executive_produced M3 .
  ?x0 ns:film.writer.film M1
  }