query: SELECT ?item ?itemLabel ?sample ?sampleLabel
  WHERE	
  {
  	{
  		SELECT ?item (COUNT(?value) AS ?count) (SAMPLE(?value) AS ?sample) {
  			?item wdt:P1302 ?value .
  		}
  		GROUP BY ?item
  		HAVING ( ?count = 1 )
  	}
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } .
  }
  LIMIT 100