one of the rarest kinds of films : 
(ROOT (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (JJS rarest) (NNS kinds)) (PP (IN of) (NP (NNS films))))) (: :)))
(ROOT (NP (NP (CD )) (PP (IN ) (NP (NP (DT ) (JJS ) (NNS )) (PP (IN ) (NP (NNS ))))) (: )))