What are theprovincial or territorial capital city in Canada which start with the letter yellowknife
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q21507383 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'yellowknife')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
provincial or territorial capital city in canada: Q21507383