If I have an 8-bit ALU, how would I hook them up to do the layer thing (I don't know the name)? It's the thing that you start with 4 ALUs, then they go down to 2, then those go down to 1. Are all the inputs for each of the original 4 seperate, or do they share some inputs? How to two go down to one? The outputs of one are the As of the next and the outputs of the other are the Bs of the next? What about the Cout, Zero, and Set? Do they somehow go into the next?