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formerly posted as h.hatena.ne.jp/screwflysolver/228172641934822432
http://www.google.co.jp/logos/doodles/2015/holidays-2015-day-1-6575248619077632-res.png
http://www.google.co.jp/logos/doodles/2015/holidays-2015-day-1-6575248619077632-hp.jpg
formerly posted as h.hatena.ne.jp/screwflysolver/228172641934822432