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Its done due to manage electrical supply,clearly done all the things you can attached in this design.We can do this step by step due to because electrical is not easy thing if you do a miner mistake its will be danger more than u can thing .You done this step by step because you done first step then now you can do a second step,not like this you can done second step before a first step not like this, you can do last step first then you do first step if you have done like this your circuits will totally failed and not for ready to do any works.
