(S (S (S (BASENP (NNP Zuma)) (VP (VP (VP (VBD visited) (BASENP (NNP Mandela))) (ADVP (RB again))) (PP (IN on) (BASENP (NNP Christmas))))) (COMMA ,) (SBAR (IN as) (SINV (VBD did) (NP (BASENP (NNP Graca) (NNP Machel)) (COMMA ,) (NP (BASENP (NNP Mandela) (POS 's)) (NN wife)))))) (PERIOD .))