question: Were M4 and M5 executive produced by a Canadian film editor that M2 and M3 starred
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:film.actor.film/ns:film.performance.film M2 .
  ?x0 ns:film.actor.film/ns:film.performance.film M3 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  M4 ns:film.film.executive_produced_by ?x0 .
  M5 ns:film.film.executive_produced_by ?x0
  }