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My can opener opens cans. When it no longer performs its task, I will replace it. Before that, added features won't entice me to replace my can opener. My e-reader is for reading books, and I'll keep it as long as it still performs its task. When it breaks I will get a new one. I expect that the next reader I buy will have more functions, but those added functions won't entice me to replace a perfectly good e-reader.
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