Was a prequel of M0 produced by a film producer 's employer and executive produced by M1
SELECT count(*) WHERE {
?x0 ns:film.film.executive_produced_by M1 .
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x0 ns:film.film.sequel M0 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
?x2 a ns:film.producer
}