query: SELECT ?property (COUNT(DISTINCT ?school) as ?count) WHERE {
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
    ?school wdt:P31/wdt:P279* wd:Q3914.
    ?school ?property ?schoolDistrict.
    ?schoolDistrict wdt:P31/wdt:P279* wd:Q398141.
  }
  GROUP BY ?property
  ORDER BY DESC(?count) 