query: SELECT ?item (COUNT(?sitelink) AS $slcnt) WHERE {
    ?item wdt:P641 wd:Q7291 .
    ?item wdt:P31 wd:Q5 .
    FILTER NOT EXISTS { ?item wdt:P569 ?dummy0 }
    OPTIONAL { ?sitelink schema:about ?item . }
  } 
  GROUP BY(?item) ORDER BY DESC(?slcnt) LIMIT 10000