question: Was M2 written by M1 's Canadian cinematographer and executive produced by M3 and M4
query: SELECT count(*) WHERE {
  ?x0 ns:film.cinematographer.film M1 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  M2 ns:film.film.executive_produced_by M3 .
  M2 ns:film.film.executive_produced_by M4 .
  M2 ns:film.film.written_by ?x0
  }