Tell me isotope of carbon whose name has the word carbon in it.
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q471790 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'carbon')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
isotope of carbon: Q471790