# boolean expression to NOR gate (MUX)

I have a 2:1 MUX. It would be designed by using NOR gates. Inputs are X and Y. S, which is data select. When S is 0 F=X , S is 1 F=Y. Until here, okey. I've found $$F = S'X + SY$$ to make NOR, I've rewritten as $$F = [(S + X') (S' + Y')]'$$ At this point , I'm stuck how I can make(draw) the expression by using just NOR gates. Actually, It can be drawn via softwares.But, I wonder that how I should think to draw. I need its logic.