a fifty car pileup of cliches . 
(ROOT (NP (NP (DT a) (NML (CD fifty) (NN car)) (NN pileup)) (PP (IN of) (NP (NNS cliches))) (. .)))
(ROOT (NP (NP (DT ) (NML (CD ) (NN )) (NN )) (PP (IN ) (NP (NNS ))) (. )))