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You probably got a few high links on a high pr page from somewhere without knowing it.
I do however have another theory which may be completely wrong but my maths isnt good enough to prove or disprove it. The google PR equation relies on the number of incoming links, and the numbers of incoming links to the pages where those links are coming in from to assign a value. As i understand it you get a kind of "which came first the chicken or the egg" scenario so the way the equation works is to put a predicted value in which may be completely wrong, but after running the equation x amounts of times you finally end up with a figure that is pretty close to accurate. I believe the reason new sites recently indexed rank high is due to this fact and the reason that they subsequently dissapear from SERPS is because this process is going on.
I may be completely off the mark but it makes sense to me.
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Endless Loop: n., see Loop, Endless.
Loop, Endless: n., see Endless Loop.
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