Tell me the regional organization that shares borders with South Sudan and contains the word arab in it's name?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q4120211 . ?sbj wdt:P47 wd:Q958 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'arab')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
regional organization: Q4120211 south sudan: Q958