Were M3 and M4 edited by a American writer of M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
?x0 ns:film.writer.film M1 .
?x0 ns:people.person.nationality ns:m.09c7w0 .
M3 ns:film.film.edited_by ?x0 .
M4 ns:film.film.edited_by ?x0
}