Procedure Add IC 74LS86 into ICBase-1 (74LS86).Add IC 74LS04 into ICBase-2 (74LS04).Add IC 74LS08 into ICBase-3 (74LS08).Add IC 74LS32 into ICBase-4 (74LS32).Connect Pin-20 (VCC) of ICBase-4 (74LS32) to Pin-20 (VCC) of ICBase-1 (74LS86).