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