a directorial tour de force by bernard rose , ivans xtc . 
(ROOT (NP (NP (DT a) (NN directorial) (NN tour) (NNP de) (NN force)) (PP (IN by) (NP (NP (NNP bernard) (NN rose)) (, ,) (NP (NN ivans) (NN xtc)))) (. .)))
(ROOT (NP (NP (DT ) (NN ) (NN ) (NNP ) (NN )) (PP (IN ) (NP (NP (NNP ) (NN )) (, ) (NP (NN ) (NN )))) (. )))