question: What country of nationality of a executive producer and producer of M1 , M2 , M3 , M4 , and M5 was M0 's employer
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ^ns:people.person.nationality ?x1 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
  ?x1 ns:film.producer.films_executive_produced M1 .
  ?x1 ns:film.producer.films_executive_produced M2 .
  ?x1 ns:film.producer.films_executive_produced M3 .
  ?x1 ns:film.producer.films_executive_produced M4 .
  ?x1 ns:film.producer.films_executive_produced M5 .
  ?x1 ns:film.producer.film|ns:film.production_company.films M1 .
  ?x1 ns:film.producer.film|ns:film.production_company.films M2 .
  ?x1 ns:film.producer.film|ns:film.production_company.films M3 .
  ?x1 ns:film.producer.film|ns:film.production_company.films M4 .
  ?x1 ns:film.producer.film|ns:film.production_company.films M5
  }