using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        List<string> listOfString = new List<string>(){"hello","world"};

        List<List<string>> listOfListOfString = new List<List<string>>(){new List<string>(){"hello","world"}};

        DoWithList(listOfString);

        DoWithList(listOfListOfString);

    }

    public static void DoWithList<T>(List<List<T>> strings){

        Console.WriteLine("Do something with a list of a list of strings");

    }

​

    public static void DoWithList<T>(List<T> strings){

        Console.WriteLine("Do something with a list of strings");

    }

}