Were M2 , M4 , M5 , and M6 written by M1 's Mexican actor and written by M3
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.character M1 .
?x0 ns:people.person.nationality ns:m.0b90_r .
M2 ns:film.film.written_by ?x0 .
M2 ns:film.film.written_by M3 .
M4 ns:film.film.written_by ?x0 .
M4 ns:film.film.written_by M3 .
M5 ns:film.film.written_by ?x0 .
M5 ns:film.film.written_by M3 .
M6 ns:film.film.written_by ?x0 .
M6 ns:film.film.written_by M3
}