using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<List<int>> numberLists = new List<List<int>>();

        numberLists.Add(new List<int>()

        {6, 8, 9});

        numberLists.Add(new List<int>()

        {2, 4, 7});

        numberLists.Add(new List<int>()

        {4, 7, 8});

        numberLists.Add(new List<int>()

        {2, 3, 9});

        var results = numberLists.OrderBy(x => x[0]).ThenBy(x => x[1]).ThenBy(x => x[2]);

        foreach (var result in results)

        {

            foreach (var subresult in result)

            {

                Console.Write(subresult + " ");

            }

​

            Console.WriteLine();

        }

    }

}