Tell me baseball league whose name has the word professional in it.
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q6631808 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'professional')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
baseball league: Q6631808