question: Was a character 's Mexican British actor M1
query: SELECT count(*) WHERE {
  ?x0 a ns:fictional_universe.fictional_character .
  M1 ns:film.actor.film/ns:film.performance.character ?x0 .
  M1 ns:people.person.nationality ns:m.07ssc .
  M1 ns:people.person.nationality ns:m.0b90_r
  }