12 June 2018
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https://www.oercommons.org/authoring/32120-%E6%97%A5%E6%9C%AC-vs-%E3%83%91%E3%83%A9%E3%82%B0%E3%82%A2%E3%82%A4-%E7%94%9F%E6%94%BE%E9%80%81-hd/view
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