query: SELECT DISTINCT ?property1 ?property1Label ?property2 ?property2Label
  WHERE 
  {
    ?property1 wdt:P1696 ?property2 .
    FILTER (?property1 != ?property2)
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],de". }
  } 
  ORDER BY ?item1Label
  