query: SELECT ?item (COUNT(DISTINCT ?st) as ?count)
  WHERE
  {
      ?item wdt:P407 wd:Q652 ;
            wdt:P31/wdt:P279? wd:Q202444 . 
      ?item p:P1705 ?st
  }
  GROUP BY ?item
  HAVING (?count > 0)
  ORDER BY DESC(?count)
  LIMIT 10