Which is the tungsten alloy that has an effect on tungsten carbide exposure and starts with the letter c?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:/instance of/ wd:// . ?sbj wdt:/has effect/ wd:/tungsten carbide exposure/ . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'c')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 