4. Figure 3.11 shows synaptic connections to produce a cell that responds to “A and B if not C.” Construct a wiring diagram so that a cell responds to “A or B if not C.” This is much trickier than it sounds. If you simply shift the threshold of cell X to 1, it will respond to “A if not C, or B if not C, or A and B even if C.” Can you get X to respond to either A or B, but only if C is inactivepg99 (Hint: You might need to introduce one or two additional cells on the way to X.)