using System;

using System.Collections.Generic;

using System.Linq;

​

namespace CodeMatchingExample

{

    public class Program

    {

        public static void Main(string[] args)

        {

            List<string> existingCodes = new List<string> { "AB101", "AB102", "AB103" };

​

            Dictionary<string, List<string>> codeLists = new Dictionary<string, List<string>>

            {

                { "List 1", new List<string> { "AB101" } },

                { "List 2", new List<string> { "AB102" } },

                { "List 3", new List<string> { "AB103" } },

                { "List 4", new List<string> { "AB101", "AB102" } },

                { "List 5", new List<string> { "AB101", "AB102", "AB103" } },

                { "List 6", new List<string> { "AB101", "AB102", "AB103","AB104" } },

                { "List 7", new List<string> { "AB101", "AB102", "AB105","AB104" } }

            };

​

            var matchingLists = codeLists.Where(kvp => kvp.Value.All(code => existingCodes.Contains(code)))

                                         .ToDictionary(kvp => kvp.Key, kvp => kvp.Value);

​

            if (matchingLists.Count > 0)

            {

                Console.WriteLine("Lists with all codes present:");

                foreach (var listName in matchingLists.Keys)

                {

                    Console.WriteLine(listName);

                }

​

                var maxMatchesList = matchingLists.OrderByDescending(pair => pair.Value.Count).FirstOrDefault();

                Console.WriteLine("Exclusive Match: " + maxMatchesList.Key);

            }

            else

            {

                Console.WriteLine("No matching list found.");

            }

        }

    }

}

​