Implementation of Type of Association

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Composition
{
    class Program
    {
        static void Main(string[] args)
        {

        }
    }

    public class House
    {
        IList<Room> rooms = new List<Room>();
    }

    public class Room
    {
        
    }

    public class ClassRoom
    {
        IList<Student> studets = new List<Student>();
    }

    public class Student
    { 

    }
}