Which is the gas giant that is a child astronomical body of Prometheus and contains the word saturn in it's name?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q121750 . ?sbj wdt:P398 wd:Q17739 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'saturn')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
gas giant: Q121750 prometheus: Q17739