what kind of books
what kind of book
pro:int n prep n
what kind of books?
w ʌ t WORD_BOUNDARY k aɪ n d WORD_BOUNDARY ʌ v WORD_BOUNDARY b ʊ k s WORD_BOUNDARY
w h a t WORD_BOUNDARY k i n d WORD_BOUNDARY o f WORD_BOUNDARY b o o k s ? WORD_BOUNDARY