question: Which film producer employed M1 and M2 and was founded by a film 's writer
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.producer .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  ?x0 ns:organization.organization.founders ?x1 .
  ?x1 ns:film.writer.film ?x2 .
  ?x2 a ns:film.film
  }