OK so let's take out one cell of your brain and build two identical electronic braincell replacements (if braincells need randomness, let's say they're both con

OK so let's take out one cell of your brain and build two identical electronic braincell replacements (if braincells need randomness, let's say they're both connected to the same source of randomness, or use they same pseudo-random algorithm.) Let's connect them both to the remaining part of the brain, i.e., all the outgoing signals from the brain go to a switch that splits the signal and sends it to both electronic replacements, and all the incoming signals from the replacement cells to the brain go through a switch that asserts that the two inputs from the electronic braincells are identical and sends out just one copy to the original brain. Now let's repeat the procedure for every remaining braincell, with the correction when the two electronic braincells should connect to one another, we connect them directly in both copies, without going through the switch. In the end of this procedure we will have two identical electronic brains, connected to the same input from the senses, and the same source of randomness so they work identically. We can make them to two completely different persons by bifurcating the input at some point, then the two electronic brains' states will bifurcate too. Which of the two is "you"? They are completely symmetric. And if neither is "you", then how is it different from your thought experiment?