using System;

public class Program

{

    public static void Main()

    {

        int[] row0 = [1, 2, 3];

int[] row1 = [4, 5, 6];

int[] row2 = [7, 8, 9];

int[] single = [..row0, ..row1, ..row2];

foreach (var element in single)

{

    Console.Write($"{element}, ");

}

    }

}