http://science6.2ch.net/test/read.cgi/math/1247494646/62 2009/07/14 17:49:04
http://science6.2ch.net/test/read.cgi/math/1247494646/67 2009/07/14 20:12:28
http://science6.2ch.net/test/read.cgi/math/1247494646/68 2009/07/14 20:16:00
http://science6.2ch.net/test/read.cgi/math/1247494646/69 2009/07/14 20:23:50
