using System; 

using System;

using System.Collections.Generic;

using System.Linq;

​

​

public class Program 

{ 

    public static void Main() 

    { 

        var entityInvestmentOption = new List<Tuple<Decimal, String, String>>();

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (1, "EDR-MO-ACONS-02", "Composite"));

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (2, "EDR-MO-BPRUD-02", "Composite"));

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (3, "EDR-MO-CEQUI-02", "Composite"));

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (4, "EDR-MO-EDYNA-02", "Composite"));

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (4, "EDR-MO-ACONS-01", "Composite"));

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (4, "EDR-MO-BPRUD-01", "Composite"));

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (4, "EDR-MO-CEQUI-01", "Composite"));

        entityInvestmentOption.Add(new Tuple<Decimal, String, String> (4, "EDR-MO-EDYNA-01", "Composite"));

        foreach(var item in entityInvestmentOption){

            var proxyCodes = entityInvestmentOption.Select(eio => eio.Item1 == item.Item1 && eio.Item2 == item.Item2);

            foreach(var proxyCode in proxyCodes){

                Console.WriteLine(proxyCode);

            }

            if (proxyCodes.Where(x=>x == true).Count() > 1)

            {

                Console.WriteLine(item.Item2);

            }      

            Console.WriteLine("------");

        }

    } 

}