public static StageOutput<Pair<K, S>, T> LocalCombine<A, X, R, S, K, T>(
this StageOutput<Pair<K, X>, T> port, Func<A> factory, string name)
where A : IReducer<X, R, S>
where T : Time<T>
{
return port.LocalCombine<A, X, R, S, K, T>(factory, name, null);
}
