What are the SI base unit which start with the letter second
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q223662 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'second')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
si base unit: Q223662