an excruciating demonstration of the unsalvageability 
(ROOT (NP (NP (DT an) (JJ excruciating) (NN demonstration)) (PP (IN of) (NP (DT the) (NN unsalvageability)))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN )))))