Question: What are the electromagnetic radiation which start with the letter ray
Paraphrase: What are the electromagnetic radiation which start with the letter ray
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q12969754 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'ray')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: X-ray, X-ray, gamma ray, gamma ray