question: Were M3 and M4 produced by and written by a Canadian director and cinematographer of M1 and M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.cinematographer.film M1 .
  ?x0 ns:film.cinematographer.film M2 .
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  M3 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M3 ns:film.film.written_by ?x0 .
  M4 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M4 ns:film.film.written_by ?x0
  }