We see by proper code design we can build a system from unreliable parts and get a much more reliable machine, and we see just how much we must pay in equipment, though we have not examined the cost in speed of computing if we make a computer with that level of error correction built into it. But I have previously stressed the other gain, namely field maintenance, and I want to mention it again and again. The more elaborate the equipment is, and we are obviously going in that direction, the more field maintenance is vital, and error-correcting codes not only mean in the field the equipment
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