(S (S (BASENP (NNPS E-books) (CC and) (NNS audiobooks)) (VP (VBP are) (NP (BASENP (DT both)) (NP (BASENP (JJ big) (NNS topics)) (PP (IN of) (NP (BASENP (DT this) (NN year) (POS 's)) (BASENP (NNP Book) (NNP Fair)))))))) (PERIOD .))