Did M1 and M2 star a employee of M0 's producer
SELECT count(*) WHERE {
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x1 ns:film.producer.film|ns:film.production_company.films M0 .
M1 ns:film.film.starring/ns:film.performance.actor ?x0 .
M2 ns:film.film.starring/ns:film.performance.actor ?x0
}