public static List<string> plain(string path, int num)
        {
            List<string> result = new List<string>();
            StreamReader reader = File.OpenText(path);
            string line;
            int i = 0;
            while ((line = reader.ReadLine()) != null)
            {
                result.Add(line);
                i++;
                if (i == num) { break; }
            }
            return result;
        }