question: Were M3 , M5 , and M6 executive produced by a Mexican director of M1 and M2 and produced by M4
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:people.person.nationality ns:m.0b90_r .
  M3 ns:film.film.executive_produced_by ?x0 .
  M3 ns:film.film.produced_by|ns:film.film.production_companies M4 .
  M5 ns:film.film.executive_produced_by ?x0 .
  M5 ns:film.film.produced_by|ns:film.film.production_companies M4 .
  M6 ns:film.film.executive_produced_by ?x0 .
  M6 ns:film.film.produced_by|ns:film.film.production_companies M4
  }