Question: What are the market structure which start with the letter oligopoly
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q877707 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'oligopoly')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25