question: Was M0 's producer 's actor 's country of nationality M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.character ?x1 .
  ?x1 ns:film.producer.film|ns:film.production_company.films M0 .
  M1 ^ns:people.person.nationality ?x0
  }