What are the prefecture-level city  which start with the letter ürümqi
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q748149 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'ürümqi')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
prefecture-level city: Q748149