question: Who was a Canadian film editor that M2 was written and produced by
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.editor .
  ?x0 a ns:people.person .
  ?x0 ns:film.producer.film|ns:film.production_company.films M2 .
  ?x0 ns:film.writer.film M2 .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }