of any film more challenging or depressing 
(ROOT (PP (IN of) (NP (NP (DT any) (NN film)) (ADJP (RBR more) (JJ challenging) (CC or) (JJ depressing)))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN )) (ADJP (RBR ) (JJ ) (CC ) (JJ )))))