query: #Unique value constraint report for P2767: report listing each item
  SELECT DISTINCT ?item1 ?item1Label ?item2 ?item2Label ?value
  {
  	?item1 wdt:P155 ?value .
  	?item1 wdt:P31 wd:Q18536594 .
  	?item2 wdt:P155 ?value .
    minus {values ?value { wd:Q997453 }}
    ?item1 rdfs:label ?itemLabel filter (lang(?itemLabel) = "en"&& contains(?itemLabel, "2016 Summer Olympics"))
  	FILTER(?item1 != ?item2) .
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "lv,en" } .
  } LIMIT 500