question: Was M3 influenced by a Mexican director of M1 and M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:people.person.nationality ns:m.0b90_r .
  M3 ns:influence.influence_node.influenced_by ?x0
  }