Were M2 and M3 edited by and written by a Mexican writer and director of M0
SELECT count(*) WHERE {
?x0 ns:film.director.film M0 .
?x0 ns:film.writer.film M0 .
?x0 ns:people.person.nationality ns:m.0b90_r .
M2 ns:film.film.edited_by ?x0 .
M2 ns:film.film.written_by ?x0 .
M3 ns:film.film.edited_by ?x0 .
M3 ns:film.film.written_by ?x0
}