Tell me me a ethnic group whose name consist of the word "sioux" and whose language used Sioux
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q41710 . ?sbj wdt:P2936 wd:Q13268 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'sioux')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
ethnic group: Q41710 sioux: Q13268