question: What was executive produced by a film director that M1 and M2 were played by and M3 and M4 were played by
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.executive_produced_by ?x1 .
  ?x1 a ns:film.director .
  ?x1 ns:film.actor.film/ns:film.performance.character M1 .
  ?x1 ns:film.actor.film/ns:film.performance.character M2 .
  ?x1 ns:film.actor.film/ns:film.performance.character M3 .
  ?x1 ns:film.actor.film/ns:film.performance.character M4
  }