query: embed.html#SELECT ?item ?itemLabel ( COUNT(?iedvien) as ?iedv1 ) ( COUNT(?iedvien) - COUNT(DISTINCT ?iedvien) AS ?iedv)
  WHERE
  {
  	?item p:P625/ps:P625 ?iedvien .
  	?item wdt:P17 wd:Q668 .
      ?item wdt:P31 wd:Q55488 .
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
  }
  GROUP BY ?item ?itemLabel
  HAVING (?iedv1 > 1) # for testing
  # HAVING (?iedv > 1) # to find actual duplicates
  ORDER BY DESC(?iedv) ?itemLabel