What is the nationality of the successor of Nii Okaidja Adamafio ?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Nii_Okaija_Adamafio> <http://dbpedia.org/property/successor> ?x . ?x <http://dbpedia.org/ontology/nationality> ?uri  . }
Nii_Okaija_Adamafio