def compare_ids(pool_of_narratives_ids, pool_of_summaries_ids) -> list:
    """Finds which narrative IDs are not yet among the summary IDs and thus need to be summarized."""
    to_summarize = []
    for i in pool_of_narratives_ids:
        if i not in pool_of_summaries_ids:
            to_summarize.append(i)
    return to_summarize