Nothing at all!
( Nothing ( ( at all ) ! ) )
(ROOT (FRAG (NP (NN Nothing)) (ADVP (IN at) (DT all)) (. !)))
Not even a hint.
( Not ( even ( ( a hint ) . ) ) )
(ROOT (FRAG (RB Not) (RB even) (NP (DT a) (NN hint)) (. .)))