namespace System.Reactive.Joins { public class Pattern<[System.Runtime.CompilerServices.Nullable(2)] TSource1, [System.Runtime.CompilerServices.Nullable(2)] TSource2> : Pattern { public Pattern<TSource1, TSource2, TSource3> And<[System.Runtime.CompilerServices.Nullable(2)] TSource3>(IObservable<TSource3> other); public Plan<TResult> Then<[System.Runtime.CompilerServices.Nullable(2)] TResult>(Func<TSource1, TSource2, TResult> selector); } }