question: Did a screenwriter that wrote a film direct and edit M1
query: SELECT count(*) WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:film.writer.film ?x1 .
  ?x1 a ns:film.film
  }