def tokenize(self, data):
        '''
        Tokenize sentence.

        Args:
            [n-gram, n-gram, n-gram, ...]

        '''
        super().tokenize(data)
        token_tuple_zip = self.n_gram.generate_tuple_zip(self.token, self.n)
        token_list = []
        self.token = ["".join(list(token_tuple)) for token_tuple in token_tuple_zip]
Tokenize sentence.

        Args:
            [n-gram, n-gram, n-gram, ...]