query: SELECT DISTINCT ?item ?itemLabel
  WHERE
  {
    hint:Query hint:optimizer "None".
    ?item wdt:P105 wd:Q35409. 
    ?item wdt:P171/wdt:P171* wd:Q764.
    hint:Prior hint:gearing "forward".
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE]". }
   }
  ORDER BY ?item