question: Did M1 star M2 and M3 and star a film director
query: SELECT count(*) WHERE {
  ?x0 a ns:film.director .
  M1 ns:film.film.starring/ns:film.performance.actor ?x0 .
  M1 ns:film.film.starring/ns:film.performance.actor M2 .
  M1 ns:film.film.starring/ns:film.performance.actor M3
  }