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https://hanzama.x0.to/2020/07/20/the-wi-fi-is-70-of-the-news-post-seven-the-second-largest-in-infrastructure-in-the-country-after-the-electric-power-gas-utility/
Wi-Fiは電気ガス水道に次ぐ第4のインフラ 国内普及率70%(NEWSポストセブン)