What is the name of the music festival that is based on Sanremo Music Festival and that starts with the letter "c"?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q868557 . ?sbj wdt:P144 wd:Q206959 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'c')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
music festival: Q868557 sanremo music festival: Q206959