def METHOD_NAME(tk_list):
    # truncate duplicate punctuations
    while tk_list and len(tk_list) > 4 and len(tk_list[-1]) == 1 and unicodedata.category(tk_list[-1]).startswith('P') and all(it == tk_list[-1] for it in tk_list[-4:]):
        tk_list = tk_list[:-3]
    return tk_list