All of these examples were triggered by pressing 4 buttons. Very easy for me operating overnight. Even though there were actually 10 possible variants. (WAT>WAT, WAT>PB, WAT>HUB, WAT>FF, PB>WAT, PB>PB, PB> HUB, HUB>WAT, HUB>PB, HUB>HUB). This was achieved thanks to the GPI logic.