def unique(anylist):
    """
    Args: anylist, an arbitrary list
    Return: a list of unique items in anylist
    """
    # intilize a null list
    unique_list = []
    # traverse for all elements
    for x in anylist:
        # check if exists in unique_list or not
        if x not in unique_list:
            unique_list.append(x)
    return unique_list