Was M3 edited by a person and edited by a Canadian cinematographer
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x1 a ns:film.cinematographer .
?x1 ns:people.person.nationality ns:m.0d060g .
M3 ns:film.film.edited_by ?x0 .
M3 ns:film.film.edited_by ?x1
}