question: What company wrote M1 , wrote M2 , and produced a film
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:business.employer .
  ?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
  ?x0 ns:film.writer.film M1 .
  ?x0 ns:film.writer.film M2 .
  ?x1 a ns:film.film
  }