question: Was M1 's executive producer and writer a Mexican screenwriter that M2 and M3 were written by and executive produced by
query: SELECT count(*) WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:film.producer.films_executive_produced M1 .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:film.producer.films_executive_produced M3 .
  ?x0 ns:film.writer.film M1 .
  ?x0 ns:film.writer.film M2 .
  ?x0 ns:film.writer.film M3 .
  ?x0 ns:people.person.nationality ns:m.0b90_r
  }