question: Was a Mexican editor of M2 , M3 , and M4 a film director
query: SELECT count(*) WHERE {
  ?x0 a ns:film.director .
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:film.editor.film M3 .
  ?x0 ns:film.editor.film M4 .
  ?x0 ns:people.person.nationality ns:m.0b90_r
  }