Did M2 employ a person that M1 starred , was edited by , and was produced by
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}