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![Lispのカレンダー | Advent Calendar 2013 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/bcbb374eb368f96b4757d229dc95cfdcacb93f76/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Fadvent_calendar%252Fogp%252Fcalendar-ogp-background-c24e7570f8dc39b6f4e1323cbd83d11f.jpg%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark-x%3D142%26mark-y%3D128%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZ0eHQtY29sb3I9JTIzRkZGRkZGJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dD1MaXNwJTIwQWR2ZW50JTIwQ2FsZW5kYXIlMjAyMDEzJnc9OTE2JnM9MzE1Zjg0YjYxYmRhYzk1YjhjOGJjNDkzMzU1MzNiNjI%26blend-mode%3Dnormal%26blend-x%3D142%26blend-y%3D491%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZ0eHQtY29sb3I9JTIzRkZGRkZGJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTM2JnR4dD0lNDBnaG9zdCZ3PTkxNiZzPTg4YWE5MDUwZjY3ZGU1ZTRjYjM0YmQ3ZDQ1NWU5Nzgz%26s%3Db2ea12e03c21bfda5bbec90afe1f7ff0)