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<p>[QUOTE=&quot;Kasia, post: 1355090, member: 31533&quot;]I don&#039;t have anything to back me up, but I would suppose that who ever puts together the grey sheet employs people who are pretty much experts in finding the pricing, and that they use algorithms that they are probably not really willing to share, depending on the variables. Put that into a data base that has been set up, with prices realized from many different sources, and keep track of the trends.&nbsp; That&#039;s what I think based on no knowledge at all of this. But I throw it out there, because it&#039;s possible I could be either hitting a couple of the points, or totally off, and someone with the experience can come along and correct this supposition.[/QUOTE]</p><p><br /></p>

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