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https://ja.hideki.hclippr.com/2013/04/15/emacs%e3%82%ab%e3%82%b9%e3%82%bf%e3%83%a0%e3%82%b9%e3%83%97%e3%83%a9%e3%83%83%e3%82%b7%e3%83%a5%e3%81%ae%e8%a8%ad%e5%ae%9a%e6%96%b9%e6%b3%95/
Emacsカスタムスプラッシュの設定方法