question: Was M1 directed by a film editor , written by M2 , edited by M4 , and written by M3
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  M1 ns:film.film.directed_by ?x0 .
  M1 ns:film.film.edited_by M4 .
  M1 ns:film.film.written_by M2 .
  M1 ns:film.film.written_by M3
  }