q15

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

namespace TestForTest
{
    class Set<T> : ICollection<T>
    {
        public int Count { get; set;  }
        public bool IsReadOnly { get; set;  }

        /*
        public Set Union(Set otherSet)
        {
            return otherSet;
        }
        */
        public void Add(T item)
        {

        }

        public void Clear()
        {

        }

        public bool Contains(T item)
        {

            return true;
        }

        public void CopyTo(T[] array, int arrayIndex)
        {

        }

        public bool Remove(T item)
        {
            return true;
        }



    }

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

        }
    }
}