http://ja.wikipedia.org/wiki/%E6%9C%9D%E6%97%A5%E6%96%B0%E8%81%9E%E7%8F%8A%E7%91%9A%E8%A8%98%E4%BA%8B%E6%8D%8F%E9%80%A0%E4%BA%8B%E4%BB%B6 http://blog.livedoor.jp/saihan/archives/51043541.html http://erict.blog5.fc2.com/blog-entry-39.htmlht…