Abstract: A study of the output of a heuristic computer program reveals two four-state binary Turing machines which yield the highest known score for four states in Rado's co-called "Busy Beaver" ...

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In order to answer these questions a bit more and start learning programming, [Nakazoto] built a 10-bit binary adder with relays. The build is designed from the ground up, including the PCBs ...

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