rel=canonical

Now, you can simply add thistag to specify your preferred version:

inside thesection of the duplicate content URLs:

http://www.example.com/product.php?xxxxx
http://www.example.com/product.php?kjkkjkk

and Google will understand that the duplicates all refer to the canonical URL: http://www.example.com/product.php?xxxxx. Additional URL properties, like PageRank and related signals, are transferred as well.

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