Was a prequel of M0 's prequel produced by a production company
SELECT count(*) WHERE {
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x0 ns:film.film.sequel ?x2 .
?x1 a ns:film.production_company .
?x2 ns:film.film.sequel M0
}