def filter(lst):
    """
    Method that filters list
    :param lst: list to be filtered
    :return: new filtered list
    """
    lst = set(lst)
    new_lst = []
    for item in lst:
        item = str(item)
        if (item[0].isalpha() or item[0].isdigit()
            ) and 'xxx' not in item and '..' not in item:
            if '252f' in item:
                item = item.replace('252f', '')
            if '2F' in item:
                item = item.replace('2F', '')
            if '2f' in item:
                item = item.replace('2f', '')
            new_lst.append(item.lower())
    return new_lst
