query: SELECT ?grouping (COUNT(DISTINCT ?entity) as ?count) (SAMPLE(?entity) as ?sample) WHERE { ?entity wdt:P31 wd:Q21191270 ; wdt:P179 wd:Q28443710. ?entity wdt:P4908 ?grouping .} GROUP BY ?grouping HAVING (?count < 1) ORDER BY DESC(?count) LIMIT 1000