question: Was a film that M4 produced and a Chinese actor produced M2
query: SELECT count(*) WHERE {
  ?x0 a ns:film.actor .
  ?x0 ns:people.person.nationality ns:m.0d05w3 .
  M2 a ns:film.film .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies M4
  }