using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        var game1 = new Game{turnOrder = new List<string> {"7F2D3F0E6CF57AA6", "884C1C7559C5CA6B"}};

        var game2 = new Game{turnOrder = new List<string> {"23412341234213123", "43b5t45g345g345g"}};

        var game3 = new Game{turnOrder = new List<string> {"435ttg34g34g545", "884C1C7559C5CA6B"}};

        var activeGames = new List<Game>()

        {game1, game2, game3};

        // LINQ Query Syntax to find out teenager students

        var result = activeGames.SelectMany(game => game.turnOrder, (game, id) => id).Where(id => id != "884C1C7559C5CA6B");

        Console.WriteLine(JsonConvert.SerializeObject(result));

        Console.WriteLine("test");

    }

​

    public class Game

    {

        public List<string> turnOrder { get; set; }

    }

}