(S (S (NP (BASENP (JJ Senior) (NNP Abbas) (NN aide)) (PRN (COMMA ,) (BASENP (NNP Azzam) (NNP al-Ahmad)) (COMMA ,))) (VP (VBD said) (SBAR (S (BASENP (DT the) (NNS talks)) (VP (MD would) (VP (VB aim) (S (VP (TO to) (VP (VP (VB persuade) (BASENP (NNP Hamas))) (S (VP (TO to) (VP (VB accept) (NP (NP (BASENP (DT the) (NN program)) (PP (IN of) (NP (BASENP (DT the) (NNP Palestine) (NNP Liberation) (NNP Organization)) (PRN (LRB -LRB-) (BASENP (NNP PLO)) (RRB -RRB-))))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (MD would) (VP (VB involve) (NP (NP (BASENP (DT an) (JJ implicit) (NNP Hamas) (NN recognition)) (PP (IN of) (BASENP (NNP Israel)))) (SBAR (WHNP (WDT that)) (S (VP (MD could) (VP (VB end) (BASENP (DT the) (NN aid) (NN blockade)))))))))))))))))))))))) (PERIOD .))