What was written and produced by a person employed by M1 and M2
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x0 ns:film.film.written_by ?x1 .
?x1 a ns:people.person .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M2
}