question: Which film editor was a French film producer that executive produced M2 , M3 , and M4 and produced M6 's prequel
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.editor .
  ?x0 a ns:film.producer .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:film.producer.films_executive_produced M3 .
  ?x0 ns:film.producer.films_executive_produced M4 .
  ?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
  ?x0 ns:people.person.nationality ns:m.0f8l9c .
  ?x1 ns:film.film.sequel M6
  }