7) Using HA and FA modules, design a 3-bit conditional subtractor which takes in the inputs A2.0, B2.0, and "Select", and an output S2.o. when Select-1, the s-A-B, when Select-O, S A+B 8) Repeat problem 7) using 1-bit carry-lookahead adders. Each 1-bit adder has a "P" and "G" output, but no Cout