Did a Canadian cinematographer that wrote M2 and edited M1 write M3
SELECT count(*) WHERE {
?x0 a ns:film.cinematographer .
?x0 ns:film.editor.film M1 .
?x0 ns:film.writer.film M2 .
?x0 ns:film.writer.film M3 .
?x0 ns:people.person.nationality ns:m.0d060g
}