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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Some writers search for mountains of inexpensive private label rights articles and edit them before posting them. These PLR articles might maybe not be the finest quality but something can be increased by the rewriting. These PLR articles are utilized as a result of fact that actually although the quality is poor, they nevertheless have aided attract visitors.
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