uses grant 's own twist of acidity 
(ROOT (VP (VBZ uses) (NP (NP (NP (NN grant) (POS 's)) (JJ own) (NN twist)) (PP (IN of) (NP (NN acidity))))))
(ROOT (VP (VBZ ) (NP (NP (NP (NN ) (POS )) (JJ ) (NN )) (PP (IN ) (NP (NN ))))))