<PackageReference Include="System.Reactive" Version="4.2.0" />

QueryablePattern<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7, TSource8>

public class QueryablePattern<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7, TSource8> : QueryablePattern
public QueryablePattern<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7, TSource8, TSource9> And<TSource9>(IObservable<TSource9> other)

public QueryablePlan<TResult> Then<TResult>(Expression<Func<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7, TSource8, TResult>> selector)