query: SELECT ?i ?iLabel ?yLabel ?r WHERE{
  ?i wdt:P31 wd:Q101352 ;
  wdt:P282 wd:Q82772;
  wdt:P1814 ?yLabel.
  OPTIONAL{?i p:P1814 [pq:P2125 ?r].}
  FILTER(!BOUND(?r))
  SERVICE wikibase:label { bd:serviceParam wikibase:language "ja". }
  }
  