What what is ethnic group  native language Indigenous languages of the Americas and also which starts with letter c
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q41710 . ?sbj wdt:P103 wd:Q51739 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'c')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
ethnic group: Q41710 indigenous language of the americas: Q51739