question: Who was a French film producer that M2 , M3 , and M4 were edited by and M6 and M7 starred
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.producer .
  ?x0 a ns:people.person .
  ?x0 ns:film.actor.film/ns:film.performance.film M6 .
  ?x0 ns:film.actor.film/ns:film.performance.film M7 .
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:film.editor.film M3 .
  ?x0 ns:film.editor.film M4 .
  ?x0 ns:people.person.nationality ns:m.0f8l9c
  }