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