Name the municipality that diocese Roman Catholic Archdiocese of Barcelona and which that starts with the letter b
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q15284 . ?sbj wdt:P708 wd:Q1364117 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'b')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
municipality: Q15284 roman catholic archdiocese of barcelona: Q1364117