def METHOD_NAME(story_lines, summary_lines, tokenizer):
    """Encode the story and summary lines, and join them
    as specified in [1] by using `[SEP] [CLS]` tokens to separate
    sentences.
    """
    story_lines_token_ids = [tokenizer.encode(line) for line in story_lines]
    story_token_ids = [token for sentence in story_lines_token_ids for token in sentence]
    summary_lines_token_ids = [tokenizer.encode(line) for line in summary_lines]
    summary_token_ids = [token for sentence in summary_lines_token_ids for token in sentence]
    return story_token_ids, summary_token_ids