question: Which art director that played M1 directed a film
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 ns:film.actor.film/ns:film.performance.character M1 .
  ?x0 ns:film.director.film ?x1 .
  ?x1 a ns:film.film
  }