question: Were M5 , M6 , and M7 edited by a Canadian director of M1 , M2 , M3 , and M4
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.director.film M4 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  M5 ns:film.film.edited_by ?x0 .
  M6 ns:film.film.edited_by ?x0 .
  M7 ns:film.film.edited_by ?x0
  }