def filter_stories(stories, triggerlist):
    """
    Takes in a list of NewsStory instances.

    Returns: a list of only the stories for which a trigger in triggerlist fires.
    """
    lists = []
    for i in stories:
        for triggers in triggerlist:
            if triggers.evaluate(i)==True:
                lists.append(i)
    # This is a placeholder
    return lists