public class Pair<T, U>
	{
		public T first;
		public U second;
		public Pair(T t, U u)
		{
			first = t;
			second = u;
		}
	}

	public static <M, N> Pair<M, N> make_pair(M foo, N bar)
	{
		return new Pair<M, N>(foo, bar);
	}