Did M3 star M4 , star a person , and star a Mexican star of M1
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:people.person.nationality ns:m.0b90_r .
?x1 a ns:people.person .
M3 ns:film.film.starring/ns:film.performance.actor ?x0 .
M3 ns:film.film.starring/ns:film.performance.actor ?x1 .
M3 ns:film.film.starring/ns:film.performance.actor M4
}