The idea behind hidden sites: you have a site that you want links into, but you don't want to give links from. In the easiest example, say RK.com wants links into it, but obviously they don't want their pay site to have a bunch of links to other people, so they give you links back from a blog network they run.
So they get links into their 'money site' and give links from their blog network.
If you are doing the same, this is a=>b c=>d linking.
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