question: Who edited M1 and M2 , wrote a film , executive produced a film , and edited M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:film.editor.film M3 .
  ?x0 ns:film.producer.films_executive_produced ?x1 .
  ?x0 ns:film.writer.film ?x2 .
  ?x1 a ns:film.film .
  ?x2 a ns:film.film
  }