Question: What are the index number which start with the letter vix
Paraphrase: What is the index number starting with the letter vix?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q1738991 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'vix')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: VIX, VIX