R S Latch using NOR gate

R --> Upper Input S --> Lower Input Q --> Green LED Q' --> Red LED R=0, S=1, — Q=1, Q’=0 = SET R=1, S=0, — Q=0, Q’=1= RESET R=0, S=0, — Q & Q’ = Last state R=1, S=1, — Q=0, Q’=0 [Forbidden]