question: Was a Mexican person that M2 and M3 were edited by and M5 and M6 were directed by M0
query: SELECT count(*) WHERE {
  M0 a ns:people.person .
  M0 ns:film.director.film M5 .
  M0 ns:film.director.film M6 .
  M0 ns:film.editor.film M2 .
  M0 ns:film.editor.film M3 .
  M0 ns:people.person.nationality ns:m.0b90_r
  }