(S (S (BASENP (NNP Mr) (NNP Iemma)) (VP (VBD conceded) (SBAR (IN that) (S (BASENP (DT the) (NN sale)) (VP (MD would) (VP (VB be) (ADJP (ADJP (RB extremely) (JJ difficult)) (PP (IN with) (S (BASENP (DT the) (JJ federal) (NN government)) (VP (VP (VBG withdrawing) (NP (PRPD its) (BASENP (NN 13) (NN percent)))) (PP (IN from) (BASENP (NN sale))))))))))))) (PERIOD .))