Give me a female idol group that starts with the letter z.
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q11446438 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'z')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
female idol group: Q11446438