question: Did a Canadian director of M2 and M3 write M0
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.writer.film M0 .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }