question: Was M2 written by M3 , written by a actor , directed by a film editor , and edited by M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.actor .
  ?x1 a ns:film.editor .
  M2 ns:film.film.directed_by ?x1 .
  M2 ns:film.film.edited_by M4 .
  M2 ns:film.film.written_by ?x0 .
  M2 ns:film.film.written_by M3
  }