question: Which French director of M4 executive produced M0 , M1 , and M2
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.director.film M4 .
  ?x0 ns:film.producer.films_executive_produced M0 .
  ?x0 ns:film.producer.films_executive_produced M1 .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:people.person.nationality ns:m.0f8l9c
  }