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wilderness - 11:47 pm on Jul 11, 2012 (gmt 0)
very unlikely and highly suspicious that a private user would request robots.txt and "nothing else".
68.47.129.zz - - [11/Jul/2012:22:45:09 +0100] "GET /robots.txt HTTP/1.1" 200 2680 "-" "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"