Question: Give me a mobile operating system, that starts with an alphabet 'w'.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q920890 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'w')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25