Was a film 's prequel directed by , edited by , produced by , and written by M1 's producer
SELECT count(*) WHERE {
?x0 ns:film.film.directed_by ?x1 .
?x0 ns:film.film.edited_by ?x1 .
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x0 ns:film.film.sequel ?x2 .
?x0 ns:film.film.written_by ?x1 .
?x1 ns:film.producer.film|ns:film.production_company.films M1 .
?x2 a ns:film.film
}