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Thanks a lot for your answer

In my case I would like to have my search page on google index, because it's what is the most relevant for users.

In this case should I prevent product page from being indexed ??

( my website is a p2p rental car in fact)

On search page (listing products)  we may have more than one link for the sameproduct :

1. a link on the title of each product
2. a link on each image's product
3. a link on a "buy" button

What is the best practice for this ? Link obfuscation? Do nothing special ?