question: Was M2 written and directed by a film editor that M1 was directed , edited , and written by
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:film.writer.film M1 .
  M2 ns:film.film.directed_by ?x0 .
  M2 ns:film.film.written_by ?x0
  }