question: What did M0 and M1 write , a film producer write , and M2 and M3 edit
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.edited_by M2 .
  ?x0 ns:film.film.edited_by M3 .
  ?x0 ns:film.film.written_by ?x1 .
  ?x0 ns:film.film.written_by M0 .
  ?x0 ns:film.film.written_by M1 .
  ?x1 a ns:film.producer
  }