's not too fast and not too slow . 
(ROOT (S (VP (VBZ 's) (ADJP (ADJP (RB not) (RB too) (JJ fast)) (CC and) (RB not) (ADJP (RB too) (JJ slow)))) (. .)))
(ROOT (S (VP (VBZ ) (ADJP (ADJP (RB ) (RB ) (JJ )) (CC ) (RB ) (ADJP (RB ) (JJ )))) (. )))