question: Did M1 and M6 write M2 and M3 , produce a film , and executive produce M4 and M5
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  M1 ns:film.producer.films_executive_produced M4 .
  M1 ns:film.producer.films_executive_produced M5 .
  M1 ns:film.producer.film|ns:film.production_company.films ?x0 .
  M1 ns:film.writer.film M2 .
  M1 ns:film.writer.film M3 .
  M6 ns:film.producer.films_executive_produced M4 .
  M6 ns:film.producer.films_executive_produced M5 .
  M6 ns:film.producer.film|ns:film.production_company.films ?x0 .
  M6 ns:film.writer.film M2 .
  M6 ns:film.writer.film M3
  }