query: #Unique value constraint report for P2949: report listing each item
  SELECT DISTINCT ?item1 ?item1Label ?item2 ?item2Label ?value ?id ?item2Description
  {
  	?item1 wdt:P2949 ?value . ?item2 wdt:P2949 ?value .
      { ?item1 wdt:P1614 ?id } union { ?item1 wdt:P2015 ?id }
  	FILTER( ?item1 != ?item2 ) . SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } .
  }
  order by ?item1