def METHOD_NAME(s):
    """
    Lower text and remove punctuation, articles and extra whitespace.
    """
    re_art = re.compile(r'\b(a|an|the)\b')
    re_punc = re.compile(r'[!"#$%&()*+,-./:;<=>?@\[\]\\^`{|}~_\']')
    def remove_articles(text):
        return re_art.sub(' ', text)
    def white_space_fix(text):
        return ' '.join(text.split())
    def remove_punc(text):
        return re_punc.sub(' ', text)  # convert punctuation to spaces
    def lower(text):
        return text.lower()
    return white_space_fix(remove_articles(remove_punc(lower(s))))