question: Was a film directed by M1 , M2 , and M3 and edited by a person
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.edited_by ?x1 .
  ?x1 a ns:people.person
  }