What was written by a employer of a person and produced by M1 's employer
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x0 ns:film.film.written_by ?x2 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x2 ns:business.employer.employees/ns:business.employment_tenure.person ?x3 .
?x3 a ns:people.person
}