query: #defaultView:Map
  #defaultView:Map
  SELECT DISTINCT ?item ?itemLabel  ?wijkcode WHERE {
    ?item (wdt:P31/wdt:P279*) wd:Q83620.
    ?item wdt:P131 wd:Q1144739.
    ?item wdt:P281 ?postcode.
    BIND (SUBSTR(?postcode,5,1) AS ?wijkcode)
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],nl". }
  }
  ORDER BY (?wijkcode)