(Adder/Subtractor Logic) Design a fully combinational adder/ subtractor 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?