The signs outside businesses are usually made with small light bulbs that can burn out over time. When one bulb burns out, it creates a blank space in the sign, which can make it harder to read. Business owners might not always notice that a bulb has burned out, and if they do notice, they may not have the time or resources to fix it right away. So the burnt-out letters can stay up for a long time, making the sign less effective.
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