Last year, we saw savings across all of Amazon's device lineups: Echo, Fire TV, eero, and Kindle. In fact, the Kindle Colorsoft saw its first-ever sale last year. But will this sale beat Amazon's Black Friday pricing? That's still to be seen.
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，详情可参考旺商聊官方下载
Range, and number of supported devices
Determine if it's satisfiable or not WITHOUT USING ANY EXTERNAL TOOLS.