(S (S (BASENP (DT A) (ADJP (JJ central) (CC and) (JJ unanswered)) (NN question)) (COMMA ,) (VP (VBZ is) (SBAR (IN whether) (S (NP (CC either) (BASENP (NNP Stephanides) (CC or) (NNP Sevan))) (VP (VP (VP (VBD profited) (ADVP (RB directly))) (PP (IN by) (BASENP (PRPD their) (NNS actions)))) (PP (IN in) (S (VP (VP (VBG executing) (CC and) (VBG implementing)) (BASENP (DT the) (JJ complex) (NN program)))))))))) (PERIOD .))