a story for more than four minutes 
(ROOT (NP (NP (DT a) (NN story)) (PP (IN for) (NP (QP (JJR more) (IN than) (CD four)) (NNS minutes)))))
(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (NP (QP (JJR ) (IN ) (CD )) (NNS )))))