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