question: Did a film star a star and executive producer of M3 and M4 and star M1 and M2
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  ?x0 ns:film.film.starring/ns:film.performance.actor ?x1 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M1 .
  ?x0 ns:film.film.starring/ns:film.performance.actor M2 .
  ?x1 ns:film.actor.film/ns:film.performance.film M3 .
  ?x1 ns:film.actor.film/ns:film.performance.film M4 .
  ?x1 ns:film.producer.films_executive_produced M3 .
  ?x1 ns:film.producer.films_executive_produced M4
  }