A_eg_B

A_eg_B=(~A0)(~A1)(~B0)(~B1)+(~A0)A1(~B0)B1+A0A1B0B1+A0
(~A1)B0(~B1)

=(~A1)(~B1){(~A0)(~B0)+A0B0}+A1B1{(~A0)(~B0)+A0B0}

={(~A0)(~B0)+A0B0}{(~A1)(~B1)+A1B1}

={A0 xnor B0} & {A1 xnor B1}