(S (S (NP (BASENP (NNP Vasco) (NNP Pedrina)) (PRN (COMMA ,) (NP (BASENP (NNP Co-president)) (PP (IN of) (BASENP (DT the) (NN union) (NNP Unia)))) (COMMA ,))) (VP (VBD called) (S (NP (BASENP (DT the) (NN difference)) (PP (IN between) (BASENP (ADJP (JJ high) (CC and) (JJ low)) (NNS incomes)))) (BASENP (DT a) (QT (DQL ``) (ADJP (JJ existential) (CC and) (JJ human)) (NN tragedy) (DQR '')))))) (PERIOD .))