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

public class Test
{
	public static void Main()
	{
            var sourceDictionary=new Dictionary<string, List<string>>();
            sourceDictionary.Add("A", new List<string>() { "A", "A", "B"});
            sourceDictionary.Add("B", new List<string>() { "C", "D", "D" });

            var distinctDict = sourceDictionary.ToDictionary(kv => kv.Key, kv => kv.Value.Distinct());
            foreach(var kv in distinctDict)
                Console.WriteLine("Key:{0} Values:{1}", kv.Key, string.Join(",", kv.Value.ToArray()));
	}
}