pile too many `` serious issues '' 
(ROOT (S (VP (VB pile) (NP (ADJP (RB too) (JJ many)) (`` ``) (JJ serious) (NNS issues) ('' '')))))
(ROOT (S (VP (VB ) (NP (ADJP (RB ) (JJ )) (`` ) (JJ ) (NNS ) ('' )))))