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http://jewelrybox.wpblog.jp/2017/10/15/%e3%80%8cruby%e3%81%8c%e3%83%9f%e3%83%8b%e3%83%84%e3%82%af%e3%80%8d%e3%81%a7ruby%e3%82%92%e5%ad%a6%e3%81%b6/
「Rubyがミニツク」でrubyを学ぶ