What employee of a film producer was a producer and editor of M0
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.editor.film M0 .
?x0 ns:film.producer.film|ns:film.production_company.films M0 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x1 a ns:film.producer
}