revolution # 9 proves to be a compelling 
(ROOT (S (NP (NN revolution) (NN #) (CD 9)) (VP (VBZ proves) (S (VP (TO to) (VP (VB be) (NP (DT a) (NN compelling))))))))
(ROOT (S (NP (NN ) (NN ) (CD )) (VP (VBZ ) (S (VP (TO ) (VP (VB ) (NP (DT ) (NN ))))))))