c# is so .. verbose

gistfile1.cs

public IPipeline<TResult,TState> Combine<T1,T2,T3,TResult>(
    IPipeline<T1,TState> a,
    IPipeline<T2,TState> b,
    IPipeline<T3,TState> c,
    IPipeline<TResult,TState> d)
{
    return a.Then(b).Then(c).Then(d);
}

public IPipeline<TResult, TState> Combine<T1, T2, TResult>(
   IPipeline<T1, TState> a,
   IPipeline<T2, TState> b,           
   IPipeline<TResult, TState> c)
{
    return a.Then(b).Then(c);
}