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I'm not sure why and if it helps, but one of my directory sites (
www.pembdirectory.co.uk ) has jumped from PR3 > PR6 in just a few months. As far as I am aware, there are less than 100 backlinks to this domain.
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Certainly is interesting - Bet you wish you know why and how to duplicate it!
PR3 to PR6 - without going to PR4 and PR5? Maybe you've got a link from a PR7 site?
links:
www.pembdirectory.co.uk showed about 189