a puzzle whose pieces do not fit . 
(ROOT (NP (NP (DT a) (NN puzzle)) (SBAR (WHNP (WP$ whose) (NNS pieces)) (S (VP (VBP do) (RB not) (VP (VB fit))))) (. .)))
(ROOT (NP (NP (DT ) (NN )) (SBAR (WHNP (WP$ ) (NNS )) (S (VP (VBP ) (RB ) (VP (VB ))))) (. )))