using System;
using System.Collections.Generic;
public class ListBuilder
{	
	public static List<T> Build<T>(params T[] values)
	{
		List<T> built = new List<T>();
		foreach (T value in values)
			built.Add(value);
		return built;
	}


	public static void Main(String[] args)
	{
		List<String> hw = ListBuilder.Build("Hello","World");
		foreach (String str in hw)
			Console.WriteLine(str);

		Pair<double,String> pair = PairBuilder.MakePair(5.0,"Five");

		Console.WriteLine(pair.First);
		Console.WriteLine(pair.Second);
	}
}


public class Pair<T,U>
{
	private T first;
	public T First
	{
		get { return first;}
	}
	private U second;
	public U Second
	{
		get { return second;} 
	}
	public Pair(T t, U u)
	{
		first = t;
		second = u;
	}
}

public class PairBuilder
{
	public static Pair<M,N> MakePair<M,N>(M f, N s)
	{
		return new Pair<M,N>(f,s);
	}
}