question: Who was a American Dutch film producer that produced M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.producer .
  ?x0 a ns:people.person .
  ?x0 ns:film.producer.film|ns:film.production_company.films M4 .
  ?x0 ns:people.person.nationality ns:m.059j2 .
  ?x0 ns:people.person.nationality ns:m.09c7w0
  }