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<p>[QUOTE=&quot;rlm&#039;s cents, post: 1091614, member: 7957&quot;]I would sooner think that it was air in the top layers - both of them.&nbsp; However, the problem with your theory and mine is that there is no reason to believe that the obverse and reverse layers had anything what so ever to do with each other and yet they have the same lines in the same direction.&nbsp; I really don&#039;t think so.[/QUOTE]</p><p><br /></p>

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