question: What was written by M0 and written by a Canadian employee of M1
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.written_by ?x1 .
  ?x0 ns:film.film.written_by M0 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x1 ns:people.person.nationality ns:m.0d060g
  }