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We determine pagerank validity on various factors - google dofollow backlinks, but this isn't 100% correct (as tons of links that raised PR are gone) so we compare it with all yahoo backlinks (dofollow and nofollow), we take domain age (there's barely PR6 domain less then 1 year old), also we check time domain was unused so all reciprocal links were deindexed).....
It's quite alchemy, I'm not revealing all the stuff around it as it's my know-how.
Anyway, PR checker will be much faster in few days ;)
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