Was a Mexican Spanish editor of M3 and M4 a person
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.editor.film M3 .
?x0 ns:film.editor.film M4 .
?x0 ns:people.person.nationality ns:m.06mkj .
?x0 ns:people.person.nationality ns:m.0b90_r
}