Integrated Circuits Used 74LS11 74LS32 74LS04 Procedure Add IC 74LS11 into ICBase-1 (74LS11).Add IC 74LS32 into ICBase-2 (74LS32).Connect Pin-12 (Input & Output) of ICBase-3 (74LS04) to Pin-5 (Input) of ICBase-3 (74LS04).Add IC 74LS04 into ICBase-3 (74LS04).