question: Which sequel of a film was directed by and written by M0 and M1
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.directed_by M0 .
  ?x0 ns:film.film.directed_by M1 .
  ?x0 ns:film.film.prequel ?x1 .
  ?x0 ns:film.film.written_by M0 .
  ?x0 ns:film.film.written_by M1 .
  ?x1 a ns:film.film
  }