int[,] tableOfNumbs = new int[6, 6];
            int[] countNumbs = new int[18];
            Random rnd = new Random(0);

            for (int i = 0; i != 6; ++i)
            {
                for (int j = 0; j != 6; ++j)
                {
                    int value = rnd.Next();
                    while (true)
                    {
                        if (countNumbs[value] < 2)
                        {
                            tableOfNumbs[i, j] = value;
                            ++countNumbs[value];
                            break;
                        }
                        else
                        {
                            if (value == 17)
                            {
                                value = 0;
                            }
                            else
                            {
                                ++value;
                            }
                        }
                    }
                }
            }