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Pinball machines are an excellent example of this. They consist of numerous electro-mechanical components that are prone to failures due to repeatedly being hit by a heavy steel ball at high speed. If one of the component breaks, it might take a while for a service technician to get out to some remote bar. To make sure that the machine can continue to collect coins, it modifies its rule-set avoiding broken components. It will also display a little dot in one of the corners of the display to signal that it is in need of repair.