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Well, in theory pure recip links are devalued by google.
And 'one way' or non recip links are seen as more natural, and therefore as likely to have more value.
In practice, a mix of recip and non recip is probably optimum. The question is, what number of each is ideal? Since recip links are traditional and still a standard in many situations, that makes each non-recip link particularly valuable, to balance out all the other recip links.
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