Was a company that M3 was produced by and a film was produced by M1
SELECT count(*) WHERE {
?x0 a ns:film.film .
M1 a ns:business.employer .
M1 ns:film.producer.film|ns:film.production_company.films ?x0 .
M1 ns:film.producer.film|ns:film.production_company.films M3
}