question: Was M6 edited by a Canadian person and produced by a costume designer that M1 , M2 , and M3 starred
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_costumer_designer .
  ?x0 ns:film.actor.film/ns:film.performance.film M1 .
  ?x0 ns:film.actor.film/ns:film.performance.film M2 .
  ?x0 ns:film.actor.film/ns:film.performance.film M3 .
  ?x1 a ns:people.person .
  ?x1 ns:people.person.nationality ns:m.0d060g .
  M6 ns:film.film.edited_by ?x1 .
  M6 ns:film.film.produced_by|ns:film.film.production_companies ?x0
  }