8. (5 pts) Sketch the circuit that computes A - B x 4. where A. B are 4-bit signed (2's complement) numbers. For example: A = 1010, B = 0111 - A - B x 4 = 13 x 4 = 52. You can only use full adders and logic gates. Your circuit must avoid overflow. ihint: In Verilog. X x 4 can be implemented as {X, 25 00})