using System;
using System.Linq;
public class Test
{
	public static void Main()
	{
        int[,] numbers = new int[3, 2] { { 2, 1 }, { 3, 4 }, { 6, 5 } };
        var all = numbers.Cast<int>();

        foreach(int i in all)
            Console.WriteLine(i);
	}
}