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 )))))))