Were M2 , M3 , M4 , and M5 influenced by a film 's Mexican writer
SELECT count(*) WHERE {
?x0 ns:film.writer.film ?x1 .
?x0 ns:people.person.nationality ns:m.0b90_r .
?x1 a ns:film.film .
M2 ns:influence.influence_node.influenced_by ?x0 .
M3 ns:influence.influence_node.influenced_by ?x0 .
M4 ns:influence.influence_node.influenced_by ?x0 .
M5 ns:influence.influence_node.influenced_by ?x0
}