Did a Mexican actor executive produce and write M1 and M2
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:film.producer.films_executive_produced M1 .
?x0 ns:film.producer.films_executive_produced M2 .
?x0 ns:film.writer.film M1 .
?x0 ns:film.writer.film M2 .
?x0 ns:people.person.nationality ns:m.0b90_r
}