Previous submissions on the same subject:<p><a href="http://news.ycombinator.com/item?id=1617639" rel="nofollow">http://news.ycombinator.com/item?id=1617639</a> <- identical<p><a href="http://news.ycombinator.com/item?id=1614085" rel="nofollow">http://news.ycombinator.com/item?id=1614085</a> <- identical, with comments<p><a href="http://news.ycombinator.com/item?id=1611663" rel="nofollow">http://news.ycombinator.com/item?id=1611663</a> <- different<p><a href="http://news.ycombinator.com/item?id=1610900" rel="nofollow">http://news.ycombinator.com/item?id=1610900</a> <- very different