question: Did M3 star a British Mexican star of M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.film M2 .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  ?x0 ns:people.person.nationality ns:m.0b90_r .
  M3 ns:film.film.starring/ns:film.performance.actor ?x0
  }