public static void Main()
string[,] arr2d = new string[3,2]{
Console.WriteLine(arr2d[0, 0]);
Console.WriteLine(arr2d[0, 1]);
Console.WriteLine(arr2d[1, 0]);
Console.WriteLine(arr2d[1, 1]);
Console.WriteLine(arr2d[2, 0]);
Console.WriteLine(arr2d[2, 1]);