private void button4_Click(object sender, EventArgs e)
        {
            label12.Text = "Статус грамматик";
            isSuccessfullyGrammaticBNF = false;
            if (!isSuccessfullyGrammaticKS)
            {
                textBox1.Text += Environment.NewLine + "Ошибка! Запишите сначала КС-грамматику";
            }
            try
            {
                BNF = KS.ConvertToBNFGrammatik();

                textBox9.Text              = BNF.ToString();
                textBox10.Text             = BNF.GetVTString();
                textBox12.Text             = BNF.GetVNString();
                textBox11.Text             = BNF.Start;
                isSuccessfullyGrammaticBNF = true;
            }
            catch (Exception ex)
            {
                textBox1.Text += Environment.NewLine + "Ошибка! " + ex.Message;
            }
        }