question: Was a sequel of M0 directed and edited by M1 's editor
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.directed_by ?x1 .
  ?x0 ns:film.film.edited_by ?x1 .
  ?x0 ns:film.film.prequel M0 .
  ?x1 ns:film.editor.film M1
  }