Was a Canadian film editor that M1 and M2 starred M3 's editor
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.actor.film/ns:film.performance.film M2 .
?x0 ns:film.editor.film M3 .
?x0 ns:people.person.nationality ns:m.0d060g
}