question: Did M1 executive produce M2 , executive produce M3 , and write a film
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  M1 ns:film.producer.films_executive_produced M2 .
  M1 ns:film.producer.films_executive_produced M3 .
  M1 ns:film.writer.film ?x0
  }