(S (S (NP (BASENP (DT The) (NN tsunami) (POS 's)) (BASENP (JJ huge) (NNS waves))) (VP (VBD entered) (PP (IN through) (NP (BASENP (DT a) (JJ small) (NN opening)) (VP (VBN provided) (PP (IN for) (NP (BASENP (DT the) (NN entrance) (CC and) (NN exit)) (PP (IN of) (BASENP (NNS boats)))))))))) (PERIOD .))