First time I've heard anything like that. Could anyone say something about it?

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It is choosing one of the the best URLs for search engines to index. It can be done by using "rel=canonical"tag.

commented: Are you sure rel=canonical is a tag? +0

It is choosing the exact url for search engine to index.The link juice will not be seperated by doing this.

It is mainly used to optimize the website. It is refers to the pages that can be loaded via multiple URLs. This is a issue that fades out the link popularity.

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