public function generate($lenght = 4, $separator = ' ')
    {
        $length = count($this->lists);

        $words = [];
        $randomArray = static::getRandomArray($lenght);
        foreach ($randomArray as $index => $random) {
            $list = $this->lists[$index % $length];
            $words[] = $list->get($random);
        }

        return implode($separator, $words);
    }