question: Did a Mexican executive producer of M0 , M1 , and M2 direct M4
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M4 .
  ?x0 ns:film.producer.films_executive_produced M0 .
  ?x0 ns:film.producer.films_executive_produced M1 .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:people.person.nationality ns:m.0b90_r
  }