query: SELECT ?item ?itemLabel ?conn
  WHERE 
  {
    ?item wdt:P31 wd:Q79007.
    ?item wdt:P131 wd:Q1731.
    ?item wdt:P281 "01326".
    optional {
       ?item wdt:P2789 ?conn 
    }
    MINUS{?item wdt:P2789 []}
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  } ORDER BY ?itemLabel