perfectly acceptable , occasionally very enjoyable children 's 
(ROOT (NP (ADJP (RB perfectly) (JJ acceptable)) (, ,) (ADJP (RB occasionally) (RB very) (JJ enjoyable)) (NNS children) (POS 's)))
(ROOT (NP (ADJP (RB ) (JJ )) (, ) (ADJP (RB ) (RB ) (JJ )) (NNS ) (POS )))