Procedure
- Connect Pin-6 (Input & Output) of ICBase-1 to Pin-18 (Input & Output) of ICBase-2.
- Connect Pin-1 (Input & Output) of ICBase-2 to Pin-6 (Input & Output) of ICBase-1.
- Connect Pin-7 (Input & Output) of ICBase-3 to Pin-1 (Input & Output) of ICBase-2.
- Connect Pin-5 (Input & Output) of ICBase-4 to Pin-7 (Input & Output) of ICBase-3.