What are the national anthem which start with the letter n
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q23691 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'n')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
national anthem: Q23691