question: Was a film directed by M1 and M2 , executive produced by a screenwriter , and directed by M3 and M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  ?x0 ns:film.film.directed_by M1 .
  ?x0 ns:film.film.directed_by M2 .
  ?x0 ns:film.film.directed_by M3 .
  ?x0 ns:film.film.directed_by M4 .
  ?x0 ns:film.film.executive_produced_by ?x1 .
  ?x1 a ns:film.writer
  }