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That and within a site, usually just due to natural linking, the first dir level will be root -1 PR, root/dir/dir will be PR-2 etc. Ive seen this effect without natural linking but there are so many other factors that play in it - outside links coming in to internal pages etc. that it gets to the point that the analysis isn't worth the waste of time that could be spent building another page LOL
Not to mention Googles "assumed" PR that it gives inside pages for about the first few months till the algo kicks in with real backlinks and PR
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