question: Which screenwriter was a Spanish Mexican person that produced M4 , M5 , M6 , and M7
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.writer .
  ?x0 a ns:people.person .
  ?x0 ns:film.producer.film|ns:film.production_company.films M4 .
  ?x0 ns:film.producer.film|ns:film.production_company.films M5 .
  ?x0 ns:film.producer.film|ns:film.production_company.films M6 .
  ?x0 ns:film.producer.film|ns:film.production_company.films M7 .
  ?x0 ns:people.person.nationality ns:m.06mkj .
  ?x0 ns:people.person.nationality ns:m.0b90_r
  }