Was M0 a Mexican film editor that M2 and M3 were written and directed by
SELECT count(*) WHERE {
M0 a ns:film.editor .
M0 ns:film.director.film M2 .
M0 ns:film.director.film M3 .
M0 ns:film.writer.film M2 .
M0 ns:film.writer.film M3 .
M0 ns:people.person.nationality ns:m.0b90_r
}