What is the name of the economy that starts with the letter 'r'?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q159810 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'r')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
economy: Q159810