question: Was a prequel of M0 produced by a production company and written by M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
  ?x0 ns:film.film.sequel M0 .
  ?x0 ns:film.film.written_by M1 .
  ?x1 a ns:film.production_company
  }