(Adder/Subtracter Logic) Design a fully combinational adder/subtracter that can be cascaded to form a multi-bit circuit. The inputs are data inputs, A and B, carry-in, CI, and borrow-in, BI. The outputs are data output, F, carry-out, CO, and borrow from left, BL. A mode input M = 0 indicates addition and M = 1 indicates subtraction. Can the carry and borrow inputs and outputs be combined?
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