(S (S (S (BASENP (NNP Crown) (NNP Prince) (NNP Abdullah)) (VP (VBZ has) (VP (VP (VBN performed) (NP (BASENP (JJS most)) (PP (IN of) (NP (BASENP (DT the) (NNS duties)) (PP (IN of) (BASENP (DT the) (JJ aging) (NN monarch))))))) (PP (IN in) (BASENP (JJ recent) (NNS years)))))) (CONJP (COMMA ,) (CC and)) (S (S (VP (VBZ is) (NP (BASENP (DT a) (ADJP (RB very) (JJ likely)) (NN candidate)) (PP (IN for) (NP (BASENP (NN succession)) (PP (IN of) (BASENP (DT the) (NN throne)))))))) (SBAR (SINV (MD should) (S (BASENP (NNP King) (NNP Fahd)) (VP (VB succumb) (PP (TO to) (BASENP (PRPD his) (NN illness))))))))) (PERIOD .))