def _checker(word: dict):
    """checks if the 'word' dictionary is fine

    :param word: the node in the list of the text
    :type word: dict
    :return: if "f", "ref" and "sig" in word, returns true, else, returns false
    :rtype: bool
    """
    if "f" in word and "ref" in word and "sig" in word:
        return True
    return False