boolean expression to NOR gate (MUX)
A=input 1, B=input 2, S=switch
from A create A' (nor port with 2 times A as input)
from B create B' (nor port with 2 times B as input)
from S create S' (nor port with 2 times S as input)
create X=(S+A')' (nor port with A' as input and S as input)
create Y=(S'+B')' (nor port with B' as input and S' as input)
create Z=(X+Y)'=((S+A')'+(S'+B')')'
create W=Z' (nor port with 2 times Z as input)
then W=(((S+A')'+(S'+B')')')'=((S'.A)+(S.B))''=S'.A+S.B