question: Was M2 's Canadian star M3 's Mexican actor
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.character M3 .
  ?x0 ns:film.actor.film/ns:film.performance.film M2 .
  ?x0 ns:people.person.nationality ns:m.0b90_r .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }