question: Were M1 and M2 directed by and edited by a screenwriter
query: SELECT count(*) WHERE {
  ?x0 a ns:film.writer .
  M1 ns:film.film.directed_by ?x0 .
  M1 ns:film.film.edited_by ?x0 .
  M2 ns:film.film.directed_by ?x0 .
  M2 ns:film.film.edited_by ?x0
  }