Was a editor of M0 employed by a production company and employed by a company
SELECT count(*) WHERE {
?x0 ns:film.editor.film M0 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x2 .
?x1 a ns:film.production_company .
?x2 a ns:business.employer
}