question: Was a film director a Mexican film editor that M3 starred
query: SELECT count(*) WHERE {
  ?x0 a ns:film.director .
  ?x0 a ns:film.editor .
  ?x0 ns:film.actor.film/ns:film.performance.film M3 .
  ?x0 ns:people.person.nationality ns:m.0b90_r
  }