Which production company was a employer of M1 's writer and star
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.production_company .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x1 ns:film.actor.film/ns:film.performance.film M1 .
?x1 ns:film.writer.film M1
}