question: What did M0 and M1 direct and a film editor direct
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.directed_by ?x1 .
  ?x0 ns:film.film.directed_by M0 .
  ?x0 ns:film.film.directed_by M1 .
  ?x1 a ns:film.editor
  }