Question: What are thewater deity which start with the letter'y
Paraphrase: Name the water deity that begins with the letter y.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q319141 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'p')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Painlevé conjecture, Painlevé conjecture, Polignac's conjecture, Polignac's conjecture, Pólya conjecture, Pólya conjecture, Pompeiu problem, Pompeiu problem, Pierce–Birkhoff conjecture, Pierce–Birkhoff conjecture, property P conjecture, property P conjecture, Parshin's conjecture, Parshin's conjecture