is silly but strangely believable . 
(ROOT (S (VP (VBZ is) (ADJP (ADJP (JJ silly)) (CC but) (ADJP (RB strangely) (JJ believable)))) (. .)))
(ROOT (S (VP (VBZ ) (ADJP (ADJP (JJ )) (CC ) (ADJP (RB ) (JJ )))) (. )))