Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.
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I enjoy this program! It saves me lots of money and time in getting write-ups for backlinks. As I claimed I am running an experiment on an internet site using only articles that are spun from it and am starting to see some positions. I believe as the website continues to grow it will continue to improve positions as well as more website traffic. Just time will certainly inform.
Other article spinners also require that you enter your own custom synonyms manually or individually approve lists of potential synonyms as they are presented to you. This is another way of expecting you to do most of thinking, as opposed to expecting the software to be smart enough to instantly make judgment calls for you. Thus, one of Spinbot's main goals is to make the article spinning process as quick and painless as possible.