SEO Best Practices
3.4.2 Content
It is common for large sites to have different URLs pulling up the same content. Search Engines store URLs as database indexes for content. Having duplicate content makes it difficult when working on Off-Site Optimization (aka Popularity via links) because it is not always certain which URL was initially indexed.
The common solution to duplicate content issues is to redirect the offending URLs via 301 Permanent move.
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