a heavy stench of ` been there , done 
(ROOT (NP (NP (DT a) (JJ heavy) (NN stench)) (PP (IN of) (`` `) (S (VP (VBN been) (ADVP (RB there)))) (, ,) (VP (VBN done)))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (`` ) (S (VP (VBN ) (ADVP (RB )))) (, ) (VP (VBN )))))