Were M2 and M5 produced by M4 , written by M1 's Mexican editor , and written by M3
SELECT count(*) WHERE {
?x0 ns:film.editor.film M1 .
?x0 ns:people.person.nationality ns:m.0b90_r .
M2 ns:film.film.produced_by|ns:film.film.production_companies M4 .
M2 ns:film.film.written_by ?x0 .
M2 ns:film.film.written_by M3 .
M5 ns:film.film.produced_by|ns:film.film.production_companies M4 .
M5 ns:film.film.written_by ?x0 .
M5 ns:film.film.written_by M3
}