the head of the class of women 's films 
(ROOT (NP (NP (DT the) (NN head)) (PP (IN of) (NP (NP (DT the) (NN class)) (PP (IN of) (NP (NP (NNS women) (POS 's)) (NNS films)))))))
(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (NNS ) (POS )) (NNS )))))))