using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Test(out var t1, out var t2, out var t3);

        Console.WriteLine($"{t1}, {t2}, {t3}");

    }

    public static void Test(out string first, out string? second, out string? third)

    {

        second = null;

        third = null;

        first = "first";

​

        third = "third";

    }

}