question: Was M0 a male German Mexican writer of M1
query: SELECT count(*) WHERE {
  M0 ns:film.writer.film M1 .
  M0 ns:people.person.gender ns:m.05zppz .
  M0 ns:people.person.nationality ns:m.0345h .
  M0 ns:people.person.nationality ns:m.0b90_r
  }