question: What did M0 write , M2 edit , M1 write , 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 M0 .
  ?x0 ns:film.film.written_by M1
  }