Were M3 and M4 edited and directed by a Mexican person that directed M2
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.director.film M2 .
?x0 ns:people.person.nationality ns:m.0b90_r .
M3 ns:film.film.directed_by ?x0 .
M3 ns:film.film.edited_by ?x0 .
M4 ns:film.film.directed_by ?x0 .
M4 ns:film.film.edited_by ?x0
}