question: Did a Canadian editor of M1 direct M2 and direct M3
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }