Were M5 and M6 produced by a Canadian editor of M1 , M2 , M3 , and M4
SELECT count(*) WHERE {
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:film.editor.film M3 .
?x0 ns:film.editor.film M4 .
?x0 ns:people.person.nationality ns:m.0d060g .
M5 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
M6 ns:film.film.produced_by|ns:film.film.production_companies ?x0
}