question: Did a film 's Mexican executive producer executive produce and write M0 and M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.producer.films_executive_produced ?x1 .
  ?x0 ns:film.producer.films_executive_produced M0 .
  ?x0 ns:film.producer.films_executive_produced M1 .
  ?x0 ns:film.writer.film M0 .
  ?x0 ns:film.writer.film M1 .
  ?x0 ns:people.person.nationality ns:m.0b90_r .
  ?x1 a ns:film.film
  }