question: Was M0 a Mexican cinematographer influenced by M2 and M3
query: SELECT count(*) WHERE {
  M0 a ns:film.cinematographer .
  M0 ns:influence.influence_node.influenced_by M2 .
  M0 ns:influence.influence_node.influenced_by M3 .
  M0 ns:people.person.nationality ns:m.0b90_r
  }