question: Was M2 produced by a Canadian editor and executive producer of M0 and produced by M3 , M4 , M5 , and M6
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film M0 .
  ?x0 ns:film.producer.films_executive_produced M0 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies M3 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies M4 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies M5 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies M6
  }