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/Program.cs

using System;
using System.Collections.Generic;
using System.Collections.Immutable;
					
public class Program
{
	// Trivial wrapper class.
	private class Wrapper
	{
		public string Value;
		
		public override string ToString()
		{
			return Value;
		}
	}
	
	public static void Main()
	{
		Console.WriteLine(string.Join("\n", new List<string>
        {
			// Create the same immtuable set twice and print each, may display different ordering!
			string.Join(", ", new List<Wrapper>
			{
				new Wrapper { Value = "first" },
				new Wrapper { Value = "second" },
				new Wrapper { Value = "third" },
				new Wrapper { Value = "fourth" },
				new Wrapper { Value = "fifth" },
			}.ToImmutableHashSet()),
			string.Join(", ", new List<Wrapper>
			{
				new Wrapper { Value = "first" },
				new Wrapper { Value = "second" },
				new Wrapper { Value = "third" },
				new Wrapper { Value = "fourth" },
				new Wrapper { Value = "fifth" },
			}.ToImmutableHashSet()),
		}));
	}
}