What kind of stories?
( ( What kind ) ( ( of stories ) ? ) )
(ROOT (FRAG (WHNP (WDT What) (NN kind)) (PP (IN of) (NP (NNS stories))) (. ?)))
What type of stories?
( ( What type ) ( ( of stories ) ? ) )
(ROOT (FRAG (WHNP (WDT What) (NN type)) (PP (IN of) (NP (NNS stories))) (. ?)))