(S (S (BASENP (NNP Forbes)) (VP (VBZ lists) (NP (BASENP (DT a) (NN world) (NN total)) (PP (IN of) (NP (BASENP (NN 1,210) (NNS billionaires)) (SBAR (WHNP (WPD whose) (BASENP (JJ combined) (NN wealth))) (S (VP (VBZ is) (NP (BASENP (QP (DOLLAR US$) (NN 4.5) (NN trillion))) (COMMA ,) (NP (BASENP (DT an) (NN increase)) (PP (IN from) (NP (NP (BASENP (JJ last) (NN year) (POS 's)) (NN total)) (PP (IN of) (BASENP (QP (DOLLAR US$) (NN 3.6) (NN trillion)))))))))))))))) (PERIOD .))