query: SELECT Distinct ?item1 ?item1Label ?item2 ?item2Label
  WHERE {
          ?item1 wdt:P31/wdt:P279* wd:Q9143.
          ?item2 wdt:P31/wdt:P279* wd:Q9143.
          ?item1 wdt:P737 ?item2.
          SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
  }
  