sayra
Level 1
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I think it can vary a lot for different sites as far as what is a perfect link profile. A good mix of quality links is the most important.
To make it simple and workable, use content based links as much as possible. Preferably original content.
Vary anchor text and the name of the site too.
The better the PR of the link page and good authority can help a lot over say, article directories. In context links are better but others do work.