Trigger wires in all possible pairings: First wire 0 in all possible pairs wire 0 wire 1 wire 0 wire 2 wire 0 wire 3 Then wire 1 in all possible pairs: wire 1 wire 0 wire 1 wire 2 wire 1 wire 3 Then wire 2 in all possible pairs: wire 2 wire 0 wire 2 wire 1 wire 2 wire 3 Then wire 3 in all possible pairs: wire 3 wire 0 wire 3 wire 1 wire 3 wire 2