query: SELECT ?item WHERE {
     ?item wdt:P31 wd:Q1357601 .
     ?item wdt:P2109 ?instcap .
     MINUS {?item wdt:P5817 wd:Q811683}   
     MINUS {?item wdt:P5817 wd:Q12377751}          
    }
  ORDER BY DESC(?instcap)
  LIMIT 20