question: Was a film 's prequel executive produced by , written by , and directed by M0
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.directed_by M0 .
  ?x0 ns:film.film.executive_produced_by M0 .
  ?x0 ns:film.film.sequel ?x1 .
  ?x0 ns:film.film.written_by M0 .
  ?x1 a ns:film.film
  }